This kind of ties into in idea I've playing with, basically a sort of meta-yelp.  Since for any given city in the world there probably are at least two or three web sites dedicated to reviewing the bar and or restaurant scene in that city, why not have a site that collects and reviews those sites.  So instead of going to Yelp to find the best restaurants in San Diego (or wherever) you'd go to this site find the best sites covering San Diego restaurants and then go to that site find a restaurant.  Anybody know if such a thing already exists?