Both Visual Studio 2010 beta 2 and .net 4.0 beta 2 are available for MSDN subscribers and on Wednesday for everybody. Perhaps an important feature is that a “go live” license is available.
Release has been announced for March 22th next year. I guess RTM will be available before the year’s end for MSDN subscribers – judging from the Visual Studio 2008 timeline.
Here is a bounch of useful beta 2 launch blog posts:
About TFS 2010
Jason Zander’s post
What’s new for the Task Parallel Libary
and of course Somma’s post
Just don’t forget that this is beta 2 release and you should be cautious – installing it in a virtual machine rather then production one is always a good practice when dealing with early builds.