var comment = post.CreateNewComment(updateText);
        post.SaveChangesCompleted += (_0, _1) =>
                                         {
                                             Assert.IsTrue(comment.Id > 0);
                                             TestComplete();
                                         };
        post.SaveChangesAsync();

IPosterousPost newPost = site.CreatePost(DateTime.Now + " Media Silverlight",
                                                         "Príliš žlutoucký kun úpel dábelské ódy", true);

                IsolatedStorageFileStream stream = new IsolatedStorageFileStream("AlbumArtSmall.jpg ", FileMode.Open, IsolatedStorageFile.GetUserStoreForSite());
                
                newPost.AppendMedium(stream, "mojeSL.jpg", isoStream => isoStream.Close());
                               
                newPost.AddTag("Všechno a nic");
                newPost.AddTag("C# omnia vincit");
                newPost.SaveChangesCompleted += (_, __) =>
                                            {
                                                Assert.IsTrue(newPost.Id > 0);
                                                TestComplete();
                                            };
                newPost.SaveChangesAsync();

public class VM_Posts : INotifyPropertyChanged
    {
        public static readonly string ASYNC_EXCEPTION_TEXT = "Error while retrieving data. See inner exceptions for details";
        
        private bool m_isBusy;
        private IEnumerable<ViewPost> m_posts;

        public VM_Posts()
        {
            m_posts = null;
            IsBusy = false;
            LinkClickCommand = new DelegateCommand<String>(link => Debug.WriteLine(link) /*m_navigationServices.HandleExternalLink(link)*/,
                                                             _ => true);
            init();
        }

        
        private void init()
        {

                IsBusy = true;
                IPosterousApplication posterousApp = PosterousApplication.Current;
                IPosterousAccount posterousAccount = posterousApp.GetPosterousAccount("<PosterousUserName>", "PosterousPassword>");

                posterousAccount.SitesLoaded += (o, e) =>
                                                    {
                                                        throwIfAsyncEx(e.Exception);
                                                        posterousAccount.PrimarySite.PostsLoaded += (_, e2) =>
                                                                                                        {
                                                                                                            throwIfAsyncEx(e2.Exception);
                                                                                                            Posts = (from p in e2.Value
                                                                                                                    select new ViewPost
                                                                                                                               {
                                                                                                                                   Title = p.Title,
                                                                                                                                   Body = p.Body,
                                                                                                                                   Url = p.Url

                                                                                                                               }).ToList();                                                                                                            
                                                                                                            
                                                                                                        };
                                                        posterousAccount.PrimarySite.LoadAllPostsAsync();
                                                    };



                posterousAccount.LoadSitesAsync();
            
            
        }

       private void throwIfAsyncEx(Exception exception)
        {
            if (exception != null)
            {
                IsBusy = false;
                throw new Exception(ASYNC_EXCEPTION_TEXT,exception);
            }
        }
        
        

        public IEnumerable<ViewPost> Posts
        {
            get
            {
                return m_posts;
            }
            private set
            {
                
                m_posts = value;
                if (m_posts != null)
                {
                    IsBusy = false;
                }
                OnPropertyChanged(new PropertyChangedEventArgs("Posts"));
                
                
            }
        }

        

        public bool IsBusy
        {
            get
            {
                return  m_isBusy;
            }
            private set
            {
                m_isBusy = value;
                OnPropertyChanged(new PropertyChangedEventArgs("IsBusy"));
            }
        }

        public ICommand LinkClickCommand
        {
            get;
            private set;
        }

        #region Implementation of INotifyPropertyChanged

        public event PropertyChangedEventHandler PropertyChanged;

        protected void OnPropertyChanged(PropertyChangedEventArgs e)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (handler != null)
            {
                handler(this, e);
            }
        }

        #endregion
    }

    public class ViewPost
    {
        public string Title
        {
            get;
            set;
        }

        public string Body
        {
            get;
            set;
        }
        

        public string Url
        {
            get;
            set;            
        }
    }
}

<navigation:Page x:Class="SL_PosterousAPITest.Home"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
    xmlns:ct="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Toolkit"
    xmlns:local="clr-namespace:SL_PosterousAPITest;assembly=SL_PosterousAPITest"
    mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480"
    Title="Home"
    Style="{StaticResource PageStyle}">

    <Grid x:Name="LayoutRoot">
        <Grid.Resources>
            <local:VM_Posts x:Key="PostsView"></local:VM_Posts>            
            <Style x:Name="PostTitleStyle" TargetType="TextBlock">
                <Setter Property="FontWeight" Value="Bold" />
                 <Setter Property="Foreground" Value="IndianRed" />
                <Setter Property="FontSize" Value="14" />
            </Style>
            <Style x:Key="PostsRectangle" TargetType="Rectangle">
                <Setter Property="RadiusX" Value="30" />
                <Setter Property="RadiusY" Value="30" />                
                <Setter Property="Fill">
                    <Setter.Value>
                        <LinearGradientBrush>
                            <GradientStop Offset="0" Color="LightYellow" />
                            <GradientStop Offset="1" Color="LightBlue" />                            
                        </LinearGradientBrush>
                    </Setter.Value>
                </Setter>
            </Style>
            <Style TargetType="ItemsControl">
                <Setter Property="Width" Value="500" />
                <Setter Property="Height" Value="360" />
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate>
                            <ScrollViewer BorderThickness="0" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto">
                                <Grid>                                    
                                    <Rectangle Style="{StaticResource PostsRectangle}">                                        
                                    </Rectangle>
                                    <ItemsPresenter Margin="15,15,0,0"/>
                                    <ct:BusyIndicator IsBusy="{Binding Path=IsBusy}" 
                                                      DisplayAfter="0" 
                                                      HorizontalAlignment="Center" 
                                                      VerticalAlignment="Center"                                                       
                                                      />
                                    
                                    
                                </Grid>
                            </ScrollViewer>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Style>
        </Grid.Resources>        
        <ScrollViewer x:Name="PageScrollViewer" Style="{StaticResource PageScrollViewerStyle}">

            <StackPanel x:Name="ContentStackPanel" DataContext="{StaticResource PostsView}">

                <TextBlock x:Name="HeaderText" Style="{StaticResource HeaderTextStyle}"
                                   Text="Home"/>
                <ItemsControl Name="itemsPosts" ItemsSource="{Binding Mode=OneWay, Path=Posts}">                  
                    <ItemsControl.ItemTemplate>
                        <DataTemplate>
                            <StackPanel Orientation="Vertical">
                                <StackPanel Orientation="Horizontal">
                                    <TextBlock Style="{StaticResource PostTitleStyle}" Text="{Binding Path=Title}"></TextBlock>                                
                                 </StackPanel>
                                <HyperlinkButton Content="{Binding Path=Url}" 
                                                 Command="{Binding Source={StaticResource PostsView}, Path=LinkClickCommand}"                                                  
                                                 CommandParameter="{Binding  RelativeSource={RelativeSource Self}, Path=Content}"
                                                 FontSize="12"
                                                 ></HyperlinkButton>                                
                            </StackPanel>
                        </DataTemplate>                        
                    </ItemsControl.ItemTemplate>
                </ItemsControl>
            </StackPanel>

        </ScrollViewer>
    </Grid>

</navigation:Page>