Google as a Nationwide Phone Directory
Ever notice that you can find a lot of people's phone number simply by going to Google and typing:
first_name last_name, city, st
Replace "first_name", "last_name", "city", and "st" with the name of the person and their home city and state. I don't know how they do it, but I can find many listed residential phone numbers this way, and some business phone numbers as well. Addresses are generally included with links to MapQuest and Yahoo! Maps.