[normloman]

Who exactly is buying all these t shirts? I never see shirts like these when I'm walking down the street.

[pjungwir]

That was my thought exactly. But I can imagine there is room for a "ThinkGeek for designers." Their second site is already a move beyond T-shirts into patches, hats, and other things. I guess they will find out!

[alxndr]

I have a shirt made by UP with the Discourse logo on it.

http://www.unitedpixelworkers.com/products/discourse