RandR, or Rise and Resist, have some pretty swell shirts. They redesigned their site in March 2009, and ever since it’s relaunch, they’ve been pumping out great designs every week. You can check out some samples of their offerings by looking at 4 and More Gore (rhyming, yay!) .
They’re another small company, so by buying from RandR you’re helping to support the little indie guys, which is always a cool thing. You’re also getting some sweet designs printed on American Apparel blanks, which is an equally cool thing.