You can download VS 2008 beta 2 and the .NET framework 3.5 beta 2 from here (you can also grab VS 2008 TFS beta 2 and the MSDN Library for VS 2008) VPCs are available if you want to evaluate on a virtual machine, which is convenient (biiiggggg though).
Check out this Channel9 Video where Somasegar and Scott Guthrie give an overview of the release(s) - lots of good stuff in there.
I'm in MS almost to months to the day so I'm (just) beginning to get a feel for the scale and logistics involved, by listening to some of the guys in developer division talk about their development processes. Anyone who's ever shipped a product of any kind knows how hard it is to get it out the door, so I tip my cap to the product team on this one. I'm looking forward to checking it out, and hopefully showing off some of the cooler features to dev teams in Ireland over the next few months.