I'm a Microsoft employee. I know a lot about the interview process. If you have specific questions please send me an email and I can personally answer your questions.
That's what I loved about being at the Redmond campus, so many GREAT people there!
I was sitting in the interview-lounge and there were so many "smug" people there, but the MS staff, awesome!
(I also got up and played the 360 for the first time in my life...for like an hour and no one else wanted to play a round with me , so much fun none-the-less)