I found this earlier and thought it was really cool. Of course you should always check for yourself, but basically this is a huge searchable database for:
eggs
fish
gluten
milk
peanuts
shellfish
soy
tree nuts
wheat
You can search things manually, go by manufacteres, vendors, resteraunts or types of food, or by going to the top and clicking what allergen you want to avoid.
I don't know if it does more than one, but still, a good find. I'm sure a lot of you already know about this, but for those who don't, take a look around! Maybe you will want to make an account and add your own safe foods.
If this needs to go somewhere else, please move it. I just hope someone can actually benefit from it.