Whole Foods seems to update their Gluten Free List often. For the latest list (updated 10.2.09) click here. There is also a Gluten Free/Casein list. If you want to see a list for a town other than Chapel Hill go to the Whole Foods website and click "stores" at the top of the page. After you find your store, go to its page and select special diets on the left hand side.
I recently bought some 365 Honey Roasted Cashews. The ingredients look as if they would be gluten free, but the cashews aren't on the list. I'm going to e-mail Whole Foods to check it out. If you have any suggestions or comments for them e-mail email@example.com.