I will be attending Tech Ed this year in Boston in a few weeks.  You can find the conference agenda and list of sessions online.  There are two Windows-specific tracks, a Windows Client track that includes 32 sessions and a Windows Server Infrastructure track with 55 sessions, including one by Mark Russinovich on the black art of Windows Hang and Crash Dump Analysis that I think I'll attend.

Personally, I'm more into the developer side of things, and there are 83 sessions in the Developer Tools track.  I'm hoping to make the time to make it to several of these sessions, including some of the WinFX, WPF, WWF, and Atlas sessions.  I'm also hosting a Birds-of-a-Feather session on Thursday on Caching in .NET Applications, where I hope there will be some good discussion about when, how, and why to use caching.