I just posted some GF beers. So, I need to plug a GF pizza place. That's right. Most pizza dough is not safe. Even the rice crust at my local Whole Foods suffers from major cross contamination (I'd never eat it). I ate at a place called Pizza Fusion in San Luis Obispo over the summer. The pizza was great, and they had GF beer to boot. They had proper procedures to prevent cross contamination, understood my dietary needs, and the pizza was awesome. The price was more than a Pizza Hut, but not unreasonable. They also have vegan, vegetarian, and lactose free options.
NOTE: Pizza Fusion's San Luis Obispo Location is now closed - not sure when it happened 7/15/10.
They recently opened a place in Santa Monica that I have been meaning to get to.
Santa Monica, CA
2901 Ocean Park Blvd. Ste 123
Santa Monica, CA 90401
Let me know if you try it.