I've been using this puppy for the last few months to create Media Center Add In applications. It's great!

http://msdn.microsoft.com/vstudio/express/visualcsharp/

You can also get all of the Express Editions (Web Developer, Basic, C#, C++ and J#) as handy-dandy CD IMG files at http://msdn.microsoft.com/vstudio/express/support/install/.

Enjoy!