Whilst I love developing apps for Windows Phone 7, the testing aspect is hard! I'm a TDD-er by default and it's such a pain to have to hand roll my own mock objects.
So I created MoqaLate.
It's an alpha version but is usable now.
Not sure framework is the right term but it's something that generates mocks from your interfaces.
Add to existing project from NuGet:
PM> Install-Package MoqaLate
Read more about the project.
Download an example solution.
Read (currently very basic!) documentation.
View on NuGet.org
Awesome overview diagram :)