Threadless

I promise I meant to recommend Threadless before CNN Money went and wrote a story about them.

The jist is this: submit and/or rate tshirt designs. Those with the best ratings in a given period win and get printed, then you get to buy them.

Aside from yielding some really cool shirts, the site has become a very approachable and friendly design forum - just reading the comments is usually worth the visit.

Plus, you can vote for DJ Yahweh. I would TOTALLY buy this.