Ninja Zoo is a new kind of t-shirt design site that I've mentioned before.
They are about to launch their public beta and are looking for a few good design ninjas to be featured artists when the site goes live.
I've seen some of the stuff they are working on - the platform looks pretty awesome. The front end has been designed by TADO.
If you're interested, send a few samples of your work to artists [at] ninjazoo [dot] com