I am a nerd, and I like T-shirts. Hence, I love nerdy T-shirts. So I squealed with joy when I came across "The 10 Shirts Every Type Nerd Must Own." We've got many a type nerd teaching here, and a few in the office as well (Scott is always talking about Kerning and Leading, I think they might be old friends from his designer days).
My favorite is Helbotica. Check them all out at thedesigncubical. And Karen has some more type shirt fun over on The White Boards.