There are other free 411 services out there, but I thought I'd share this one:
Google threw a new product called Goog-411 into Google Labs today – a free telephone based information service that could replace toll 411 calls. About 2.6 billion 411 calls are made in the U.S. each year, and it is a $7 billion/year market.
Goog-411 can be accessed by dialing 1-800-GOOG-411. The product is completely automated and there is no way to talk to a human for additional or clarifying information. You tell it your city and state, and then ask for a specific business or business category.