I love restaurant.com, and we buy the certificates frequently to save money on our dining out experiences.
If you live in the Chicagoland area, there is another great source for discounting your dining out costs–WTMX: Mix Dining. Each week a restaurant is featured. Typically, you buy the certificate for $25. You will receive it in the mail, and then when you go to the restaurant, the certificate enables you to buy $50 worth of food. Currently there are more than 30 restaurants you can choose from.
I shared this post at Works for Me Wednesday.