Goog411 (1-800-GOOG-411) was introduced in early 2007 as a way to access Google search results on your mobile phone. It's the equivalent of dialing 411, but it's free, and pulls multiple listings like the ones you'd get from a search in Google Maps. Mobile phone users can get listings sent to their phone via SMS, including telephone numbers and full addresses. You can also be connected to a business for free.
The entire service runs off voice-recognition technology, which has since been baked into other Google products, including Google's motion-activated iPhone app. Also, if the voice-recognition ever fails, you can simply dial in the name of the business you're looking for using your phone's keypad.