I just got an email saying that the September CTP for Orcas (That is, the next Visual Studio-centric release of what most people think of as ".NET") was just released publicly!  Go get it!  It's packaged as a Virtual PC image, so you need that or virtual server to run it, but I think that's a great deployment vehicle for these CTPs that are traditionally "difficult" to uninstall due to the nature of them being "early".

This release has some of the C# 3.0 support as well as some of the LINQ support (over objects) as well as lots of other goodies like the managed add-in model and some timezone goodness.  Unfortunately, most of these bits were baked before I got here, but it's cool to see them ship anyway.  Have fun.