Yelp

Yelp is the fun and easy way to find, review and talk about what's great - and not so great - in your local area. It's about real people giving their honest and personal opinions on everything from restaurants and spas to coffee shops and bars.

By using the Yelp API you’ll be able to: Find up to 40 best results for a geographically-oriented search. Sort results by the best match for the query, highest ratings, or distance. Limit results to those businesses offering a Yelp Deal, and display information about the deal like the title, savings, and purchase URL. Identify and display whether a business has been claimed on Yelp.com.
More information: http://www.yelp.com/developers/