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Fark.com and CNN.com also do this. And it's an awesome idea. Geeks love snarky/one-liner tshirts.

(hint: offer them in black and in XXL)

I wish there were fewer black tshirts out there. I will buy any color but black.

Zazzle does. In fact, they just launched a partnership with Urban Dictionary. Every single definition now has a little "Get this on a mug" link.

also check out printfection.com

fantastic idea! you gotta do the shirts. some of these lines are hilarious and most importantly original.

p.s. y combinator should have a "forgot my password" button...or if they already do, make it a little more prominent