Have you seen the .NET Languages site?
I just found out about it today, so I'm betting you haven't. It's been around for a couple years though and is definitely worth checking out. It's maintained by my coworker Jason Bock (who also happens to be a scary smart dude and a BADASS drummer!)
Anyway, check it out here:
http://dotnetlanguages.net
If you couldn't make Lang.NET 2008, he's got a nice writeup on that as well.