Simmer (formerly Foodie) - Yelp, but for every dish on the menu
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Spoon University - Food network for next generation.
Facebook Local - Discover places to go and events happening near you
NYT Cooking - iPhone app with 17,000 free recipes from The New York Times
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets