White Pages typically indexes by a person or business name and return an E-Mail address, mail address, or phone number. Sometimes they provide street level maps and Web site links.
Switchboard Seems to keep reasonably up to date.
Yellow pages, White pages, Email address. BigYellow Yellow pages. Interactive Yellow Pages Yellow pages. AnyWho Telephone Number, Email, Home Page URL, FAX, Toll Free, Address, country codes, zip codes. Includes reverse lookup .