SnagNYC lets you see reservation availability for 60 of NYC's top restaurants. Instead of having to constantly refresh a million different reservation sites, you have an all-in-one site that lets you see when slots open up for the most competitive restaurants. It updates regularly every 10-15 minutes, has numerous filters (party, date, cuisine, neighborhood), and is completely free to use. It's helped me get reservations at some of NYC's top restaurants.
