Yelp rox
For the last two years, Yelp had been of invaluable, er. help, when it came to find information about local services and business during my visits to San Francisco.
I was dreaming of having something similar in Paris just for restaurants (heavily using google maps and Metro station network), but I left Paris :D
In France, justeacote launched not so long ago to do something similar, let's see how it goes a bit later.
Anyhow, Yelp just got it right. Kudos.
Comments
The closest I've found for Paris is cityvox. It's okay. But not as good as yelp.
But as you said it's not as good... something is missing (or there's too much I don't know), and I'm not sure one can easily add places/events without moderation. Yelp is friendly.