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Checkdomain
Use this site when you come across an e-mail address and it's not apparent what organization it goes to. Be sure to include the ".edu" or ".com" or other extension with the address.

Yahoo! People Search
Search for e-mail address by name; qualify by geographic location.

Info Space
This site includes e-mail addresses.

AOL.Com People & Chat Directory
This site includes an E-Mail Finder.