This awesome thingy has ended. Sorry.
Some of you have probably heard of this already, but M$ has this
training program for some of its new crap. If you go through it, and take some quizzes, you can earn yourself a free copy of XP pro(EDIT: no more XP, read below), wireless mouse, and more. All you have to do is invent a company, set up a passport account, and then train. Make sure your company address is your own.
For all those who don't want to learn, go
here. Of course, I bet some of you are paranoid about giving your address to M$, but this was on Kevin Rose's (of TSS) website. I think it's legit.
EDIT: BTW, I copied the answers from the forum that Kevin Rose linked to...and is now a dead link (good thing I thought to save them)