Quick headsup for you: Threadless has a back to school sale on. $10 shirts until September 3rd. So word to the wise: if you want to snag something for a birthday or Xmas, now's the time. Don't forget they have kiddie sizes for shirts too--perfect gifts for the kids of friends.
Also, for those that love black like I do, I've posted a round-up of cool black Threadless shirts you can snag at the sale over on Colors Are Overrated.