Four years ago, I started participating on threadless, due to a love of their awesome t-shirt designs, and an admiration of the folks who designed for them. Since then I've been printed there multiple times, have met some awesome people, and have been able to branch out into t-shirt design. It's threadless' 10 year anniversary, and they've released a lovely book published by Abrams. I feel really fortunate to have a piece in it, and highly suggest you guys pick up a copy, if not for my art, for the hundreds of amazing artists work featured in it as well!
Here's the link to buy it: http://www.threadless.com/book
Or you can purchase a copy at your local bookstore!