I've been using this free service for months and am loving it. If you have a cell phone, do not pay ridiculous fees for phone number lookups any longer. Just dial 1-800-GOOG-411 and find a listing for free...yup...free!
My favorite thing about the service (besides the fact it costs nothing) is the different voice I hear each time I call. It's like every employee at Google recorded themselves saying "GOOG 411" so each time you call, you hear a different rendition. Some are silly, some are yelling, some are professional, but all different.
What will Google think of next?