Threadless is an internet Tshirt powerhouse with a brilliant model, let other people design all your shirts, pay someone else to print them and then all you have to worry about is customer support, order fufillment, and web/community maintenance.

I've heard talk that Threadless has peaked, and they may be on the verge of 'jumping the shark'.

Friends of Enclothe, HipHipUK have a thought provoking post entitled

7 reasons why Threadless don‚’t rule (as much as they used too)