Nice site. If I had to nitpick, I'd say put the FAQ above the order form, and would've liked to get at least some sort of representation of what sort of tees I'd be getting.

The idea reminds me a lot of Valley Schwag[0], which was doing something very similar back in 2006... I got a few great tees out of being a member there, and a tonne of stickers and other little promo items.

[0]:http://techcrunch.com/2006/05/04/get-web-20-schwag-from-vall...