Indeed. I went to a fabulous tiny restaurant in philly recently. While chatting with owner, she mentioned that a reservation had just canceled and then proceeded to tweet that there was an open table. Within literally 2 minutes, she filled the reservation.

Who says restaurant owners don't get computers!

The saavy ones know their core competency and don't try to get fancy. The restaurant I mentioned has a super simple website done with inuit sitebuilder. It does the job, but with places like this the most important thing is what others say about the place and the clout the owner cultivates with their customers.