Congratulations to Scott Guthrie first on his new role and responsibilities... he is the man! :) btw, he is on a roll with his product roadmap of .net 3.5 this summer.
You can see details on his blog here but for sure some of these changes are huge, such as speeding up cold load of .NET applications by 25%-40%, improving WPF support...and so on.
Check this - http://weblogs.asp.net/scottgu/archive/2008/02/19/net-3-5-client-product-roadmap.aspx
Cheers - Dipesh