If you haven't had a chance to check these out you definitely need to. There are two out so far and they are absolutely hilarious.
They've paid Jerry Seinfeld $10 million to star in a handful and the total cost will be $300 million, making it Microsoft's biggest ad campaigns, to combat Macs series of anti-Microsoft commercials.
Check it out:
http://www.youtube.com/watch?v=gBWPf1BWtkw
http://www.youtube.com/watch?v=11NOblvuEpU