RoomHunt

This is a unique service that allows you to find your perfectly matchedroommate and apartment, all in one site. Uncover dozens of compatibleroommates, based on your own personality and criteria. This free servicecurrently services over 100 major cities across the U.S. The database ofapartments for rent is one of the most extensive in the industry.

Via: http://www.roomhunt.com/roommates/location/