http://www.google.com/goog411/
free 411 for businesses, soon for residences too
yes, also you can call it when you are on the road, i've been using that for a while. it's free, and better than directory assistance charging $1.75/use.
800-466-4411 (spells goog 411 on the keypad)
i used to use 1800 free 411 but now i have gps on my phone and i get unlimited 411