Phone Directories

Anywho directory  
From AT&T Labs, this site provides phone numbers for individuals or businesses.
The Anywho site also includes

• a reverse lookup directory, which finds names and addresses from known phone numbers (with links to maps)
• a toll-free directory

Duke online telephone book

Europages
The European Business Directory.

gethuman 500 database
Tells how to reach a human on the telephone (instead of an automated system) for a myriad of US companies

InfoSpace 
Locate businesses, people, city and government information, and services.

International Dialing Codes
Provides country codes, city codes, IDD and NDD prefixes for making telephone calls between and within countries of the world.

superpages.com
Phone numbers for businesses and individuals, and yellow page entries.

Switchboard
The people and business directory.

Telephone Directories on the Web
"Yellow pages, white pages, business directories, Email addresses and fax listings from over 150 countries all around the world."

Verizon Reverse Number Lookup

WhitePages.com
Find a person or business, area code, zip code, e-mail, or web page

The World Clock
Find the current time in places around the globe.