(Or elsewhere, really...)
I stumbled on a great website today: Urbanspoon (this link goes to their page for Seattle, but they have other US cities too).
Their idea is simple: list restaurants in a city, with links to the website and menu (if available). Include linked excerpts from professional reviews, reviews from blogs, and allow visitors to vote on whether they like a place.
The website includes a map view (so you can quickly see where stuff is and what's close to you), groups restaurants by neighborhoud and type of cuisine, and is just generally fuzzy and friendly to use.
Definitely a nice tool for visitors to a city, and even for someone like me that is sometimes looking for a new place to try.