Feminist T-shirts?

I'm looking for a source for feminist / girl power T-shirts. My intent is to get a few that I can wear to geeky events (PAX East in March in particular). I want to send messages such as "take me seriously regardless of my gender," "I'm an ally to the other women here," or "don't marginalize women in this field, we're here spending money too." I do not want to send messages like "women are better than men," "I want to rip off your balls," or "woe is me, I'm downtrodden." I will not buy iron-on quality (no CafePress). Bonus points for clever phrases, well-designed graphics, environmentally friendly, small businesses, and/or union/fair trade labor. I am willing to pay more for clever phrases and well-designed graphics.

Hook me up, folks! :)

Edit: Here's a couple links so I don't lose them.
This is what a feminist looks like (Pink text on black)
Thinkgeek wishlist