Free Dinners From Opentable.com

Besides being a very convenient (and totally free) service for making online reservations in most major cities, OpenTable also offer a rewards program for people who dine out frequently. Every time you complete a reservation you can earn 100 dining points with rewards of up to 1,000 for places that are really desperate for clientele.

Now before you get all excited, 100 points basically equals one dollar and you can cash out when you reach $10. It's not going to cut your dining out budget, but if you do eat out fairly frequently, it's a nice little bonus. I'd use the service without the points just because it's so simple and quick.

One thing you might want to do is set up an account and share it with friends. My friend and I just earned a collective 10,000 dining points, which is 100 bucks. It took us almost 2 years and nearly 80 reservations. He eats out a lot more than I do, but we'll go out together a lot. (He's also well off enough that he doesn't mind picking up the tab. Frugal tip #1: Make rich friends).