I love the O'Really designs and all others in the "parody O'Reilly cover" genre, but then I love O'Reilly books and am a big ol' geek.

Copyleft now has three of the O'Really designs on T-shirts and I'm trying to decide whether to order "Distributing Clue to User" or "Windows NT User Obliteration."

For what it's worth, I have ordered from copyleft before and received good service. I've also ordered geeky shirts and other stuff from ThinkGeek.