Free 411 from Google: 1-800-GOOG-411
You just call the number, tell them who you're looking for, and they connect you to the business. Totally free! Check out the YouTube video they made below. If you say "text message," they'll send you information about the business. If your phone has the internet, you say "map it" and they'll send you a map of the neighborhood.
If you use 411 a lot, this can save you a lot of money. If you don't use 411, you can save the aggravation of Googling around for phone numbers or, heaven forbid, looking it up in the phone book.