555-1212.com White pages, yellow pages, reverse lookup, and web page finder.
AnyWho Find people and businesses in the United States and Canada.
Big Book Search U.S. yellow pages.
Internet Oracle Collection of "find people" search engines.
Switchboard Find a person. Find a business.
Telephone Directories on the Web Index of online phone books.
The Ultimate White Pages Includes a one common interface for six different phone number directories.
WorldPages.Com Business and personal listings, a vast collection of worldwide directories, as well as e-mail and web site searches.

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Google: Telephone
Yahoo!: Telephone
Librarians Index to the Internet: Telephone
BUBL: Telephone
DMOZ: Telephone