A Windows Phone Mini-Series
There are hundreds of great new features in Mango, and Windows Phone programmers will want that transition to be as smooth as possible. Margaret Parsons and I have been busily collecting links to articles, videos and blog posts that will help with the transition. We’ll be presenting them here as a mini-series on Migrating From Windows Phone 7 To Mango.
If you want to upgrade an existing Windows 7 application, this article will show you how to upgrade your application.
Finally, here is the announcement of the new SDK, complete with links for cross-submitting your applications.