Directories n Phonebooks
Any Who Toll-free Directory-- Locate toll-free numbers.
Big Book -- Business listings from American Business Information, Inc. Also includes white page listings.
Canada411 -- Canadian phone directory in both English and French.
InfoSpace -- Yellow and white pages, with reverse directory lookup.
Switchboard -- People and business directory.
Telephone Directories on the Web -- Includes a variety of national and international directories, with some links to fee-based services.
U S WEST Dex -- Yellow pages for cities in the US.