Something worth checking out. The Aussies in Oz have released a Social Viewer Application Template for Windows Phone 7.
The template mashes up Twitter, RSS/Atom and Facebook, allows for offline, trial, advertising, retweeting, sharing to facebook etc, it’s pretty neat and you can everything in XML or get more creative with code.
For more info head to http://blogs.msdn.com/b/dglover/archive/2011/04/08/windows-phone-7-social-viewer-application-template-released.aspx for more details and to download the Visual Studio template and Howto guide from Dave Glover's blog.
It’s similar to the http://www.appmakr.com/wp7 but allows for local development and a lot more customization.