Many excellent gluten-free restaurant guides exist online, but I recently discovered a web source I like in particular: http://www.celiachandbook.com/
Not only do they thoroughly cover the US but this website also offers an international list of dining venues. In fact, their entire website is very current with Upcoming GF Events as well as a well-stocked GF Bookstore. The format is basic but well thought-out and they are more than willing to answer your questions!
