Microsoft has this up for a couple of weeks, but I thought you might find it interesting.
"The Windows Vista Developer Story includes content for developers, and other technology experts and managers, interested in an in-depth exploration of some of the new and extended features in Windows Vista. It is released to the Windows Vista Developer Center in the form of brief articles, published approximately once every two weeks. Those articles are only a summary of the Windows Help file, which can be downloaded here. "
UAC seems to be very popular by the way, since Bart has a nice post on developing .NET apps for UAC, updating my old post on the same subject.