Microsoft released a set of free beta IDE's today labeled the "Express" tools. They are all betas of the next Visual Studio/.NET Framework release. (.NET 2.0 "Whidbey").
When these tools are finally released, they won't be free but they will be cheap. Probably priced like the "Standard" tools are now ~$99. Maybe less.
If you are interested in learning the new technology, it's a good place to start.
Pick them up here
http://lab.msdn.microsoft.com/express/