Don't have a shirt, but plan to order one. However, I do have an American Atheists sticker on my car and my window got smashed in. A friend of mine had a "God is just pretend" sticker on her car and it was keyed until it was illegible. The religious are such loving folks....
I'm out and proud, even if it causes some property damage!
I have a few atheist shirts and some are bold. The Out Campaign shirt is something I can actually wear to work. Unfortunately it doesn't get many comments. It is a good one to wear in that if someone does ask what it means you can start a civil conversation about positive atheism.
After the bad reactions I got from my Bush "Worst President Ever" shirt, I'm rather reluctant to wear an atheist shirt. I do plan to buy a "Darwin" fish pin, though. I think anyone smart enough to catch the meaning of the Darwin fish with legs will be intelligent enough to refrain from the snarky comments.