"Zagat to Go '09 features reviews for restaurants (and nightlife, shopping and hotels) in most major U.S. cities.
It isn't Yelp. For one, it's not free. For another, it only has very well-thought out and succint evaluations. If you're left wanting by Yelp or UrbanSpoon, Zagat to Go '09 might be right for you. Just be ready to pay $9.99 and remember that after 12/31/2009, the reviews will no longer be updated."