I installed this a day ago, and although I haven't really used it to go to any restaurants, YET, I can't seem to stop "shaking" it lol.
Go to urbanspoon.com/blackberry from ur BB browser.
Urbanspoon's Blackberry app is a kind of restaurant slot machine. Just hit the space bar (or shake the phone if you have a Storm) and the wheels will spin, until they settle on a good nearby restaurant for you. You can also lock down the neighborhood, cuisine and price you are interested in. Keep spinning until you get a restaurant you want to try.
Urbanspoon on Blackberry also lets you search and browse restaurants, and uses your current location to identify the nearest restaurants to you.