Oh, let's see - look around in the store at the tofu's - some of them are lower in carbs than others, maybe you could use tofu (stir-fry w/ veggies, just as a fr'instance?). I think it's the soft tofu's that are lower in carbs, but I forget. Rule #1: check labels! I'm not big on tofu, myself, personally.

Different meats - turkey, chicken, fish (salmon is in season up here, we've virtually been LIVING on salmon!), eggs, beef, lamb, venison, bison (if you can find it). That pretty much sums it up for animal proteins, I think. Oh, and cheeses, too (but I burn out on cheese pretty early in the day, I don't eat them 24/7).

There are protein powders you can get, too - You might be able to concoct a breakfast smoothy using one or two perfectly ripe strawberries (which I think are pretty low in carbs). You could look up strawberries on fitday.com to see how many carbs there are per berry.