Telephone and E-Mail Directories

ReferenceUSA: Directory of more than 11 million U.S. businesses. (UT Austin users)
AllPages
AnyWho (AT&T)
Austin Area Connect
DEX (Qwest)
Google: Search by entering the business name with city and state or zip code. Enter a phone number to find business/person it belongs to.
SuperPages
Switchboard
ThomasNet: Registration Required. 166,000 U.S. and Canadian manufacturing companies by name or product
Yellow Book
YellowPages.com (AT&T)
Business Finders with Maps:
Ask City
Citysearch
Google Maps (Click on: Find Businesses)
Live Search
Yahoo Local

Residential Telephone Directories (White Pages)

Escape Artist: What prefix numbers to dial to call from any country to any other country
InfoBel: Directories for most countries
International Calling Codes (ACR)
International Country and City Dialing Codes (Steve Kropla): Includes business and residential directories for Canada many European countries.
Kompass Company Directory: Includes 2 million companies in 70 countries
Canada (Canada 411)
France Directory (France Telecom)
Mexico - Yellow Pages (Seccion Amarilla)
U.K. Directory (British Telecom)

AnyWho (AT&T) Toll Free Internet Directory: U.S. toll free numbers - Only AT&T subscribers are included
Internet 800/888 Directory: Incomplete, but does include many non-AT&T numbers

Fone Finder: Looks up over 60,000 area codes and prefixes and returns a city, state, and flag.
Area Code Information and Maps [Click on "Maps"] (Areacode-Info)
Area Code Maps - By State (NANPA)
International Calling Codes (ACR)
International Country and City Dialing Codes (Steve Kropla)

InfoSpace: E-Mail address search
E-Mail Finder (AOL): E-mail address listings.
University of Texas at Austin Directory: UT Austin students, faculty and staff
Yahoo People Search: More than 6.5 million e-mail address listings