One site that I think is useful is Gayot.com which uses the Gault-Millot 20 point scale. They cover a lot of cities and seem to be pretty reliable. There is another site that is only good for Vegas but they have an exhaustive analysis of steakhouses that blew me away and helps me look for steakhouses in other cities.

http://www.gayot.com
http://vegasmadeeasy.com/dining/steakhouses