The ActiveWin crew's got an "administrator's preview" of the upcoming Windows Vista OS. They cover everything from an admin's point of view, & touch on a bunch of stuff that I certainly hadn't seen before...

"Since screenshots of the basic functions have been presented all throughout the internet over the past week, let’s look at some other things.  I am going to cover some of the enhancements that Vista will provide for administrators as well as a few neat little tidbits that I have not seen much of."