I agree with Lisa. Now this applies to the US and Canada.. If you live in a more exotic locale, the rules could be different.
Look at some of these lists. Of course, we can't list everyting that is safe or the list would be too long...bananas, oranges, white rice, brown rice, etc.
How often are theses gluten safe/unsafe food lists updated? I've looked it over, but it was first published in 2007 and I know some guidelines on food labeling have changed since then.