Accurint
AnyWho Directory
Hoover's Online
Intelius:  A paid service
Pretrieve.com:  A public records search engine
PublicData.com
Public Records Searches
Reversephonedirectory.com:  Search by name, phone number or address
SearchBug:  Free People and Company Finder
Searchsystems.net
SEC Edgar Archives:  public corporation filings
Yahoo People Search
ZabaSearch:  Free public search and public information search engine
Zoom Info:  Shows relationship between people and companies