Rollyo.com allows you to create a customized search engine using sites you specify. I have created the above search engine using restaurant industry web sites. Unfortunately I am unable to add this search to this blog, please click the image above or here to give it a try. The link has also been placed on the sidebar under "search tools".
Update: Added a "Restaurant Review Search" to "search tools". Want to know what people are saying about your restaurant on the internet? Enter the name and city of your restaurant, and find out.
(note: The sites used in the Restaurant Review Search are nationwide sites, it does not include restaurant reviews from local papers or region specific web sites.)