As I promised before... it's now live. A ton of kudos for the mscom team for listening to community feedback and implementing these great features.
RSS Feed that points at the root of all the blogs registered for Exchange [i.e. a notification of newly registered Exchange bloggers]
[Update: Fixed up links for the KB ones. Looks like there's a character limit in the “Insert hyperlink” input box :-]
[Update 7/15: I just noticed something else cool... the list of MVPs automatically rotates, so the same few MVPs don't monopolize the front page. That's pretty neat.]