I already own a couple of camera/photography-related tees, and I have to say they are some of my favorite wear. But looking at the roundup of such clothing put together by PetaPixel makes me want to hit the links and get even more.
My favorite of the 21 shirts in the collection has to be the above "oh, crop" design, which takes a leaf out of Adobe Photoshop's crop tool. The camera display panel shirt looks pretty awesome, too, and I'm still trying to figure out which dSLR display it copies. Of course, there are plenty of T-shirts on the market now that have a camera hanging around the neck, but that's so passe.