At Tech-Ed, we gave away about a bajillion (give or take a few) of buttons with various phrases on them, like "OWA ROX" or "I GOT UM":
If you'd like to buy any of your own, they're up on our cafepress store, in both button and magnet form.
At Tech-Ed, ten lucky customers walked away with buttons that said "AWW YEAH"... I never actually meant to give those out, actually, I just made them for some folks on the team and forgot to separate them out when I shipped the boxes to Tech-Ed. Oops! Apparently a few people thought that there was a contest and if you got a button with a certain phrase you'd win something... that's a great idea, wish I'd thought of it in advance.
So I figured that I'd take the opportunity here: if any of the people who got the "AWW YEAH" buttons read this, take a picture of you wearing the button and send it to me along with your snail mail address (kclemson at microsoft dot com), and I'll send you some Exchange swag. :-)