Think you can write a TFS client for Windows Phone 7? Think you can do it by the end of November? Would you like a free MSDN subscription with Visual Studio Ultimate worth about $15,000 Canadian? Then you need to read Barry Gervin's post
where he offers you not just that, but several (probably more valuable) introductions and blog mentions.
Now, you don't need to write all of Team Explorer. Barry suggests build status, dashboards, work item editing, and of course connecting to what the phone knows about People on the team. And he wants to hear from those who are trying, so he can help make it happen.
Interested? Plan your code, email Barry, write your code, and in the end email him the code and maybe a video demo by November 30th. Easy, right?