http://www.winsupersite.com/reviews/winvista_5365.asp

Paul Thurrott continues to keep us posted on the continuing builds of vista and what improvments, additions, and refinements they have. He also states that while this build has windows media player 11 in it, a beta version of media player 11 for xp will be released with in the next 2 weeks...so stay on the lookout if you want to try it out.

Anyways, his reviews are always well written and worth a read if you've got a few minutes to spare.