Research Links:

Accurint
A fairly low cost people asset and real property tracing service available to government, law enforcement and commercial customers
AnyWho
BRB Publications
Craig Ball's Sampler of Informal Discovery Links
Finding People
The Virtual Chase
Finding People
Zimmerman's Research Guide
KnowX
Merlin Information Services
Merlin provides investigators, collectors, and other professionals with low-cost online access to public record and privately owned investigative databases. Access to Merlin's databases is restricted to industry professionals who must qualify to use the service. Merlin has a variety of pricing options, from pay-per-search to flat-rate subscriptions.
NETROnline
Pandia People Search
People-Finding Guide
University of Washington School of Law Library
Pipl
A comprehensive people search on the web
Pretrieve
Public record search engine
Public Record Finder.com
Search Systems.net
Public records directory
Switchboard
Vitalrec.com
Where to Write for Vital Records
National Center for Health Statistics, U.S. Department of Health and Human Services
Yahoo Directory: Phone Numbers & Addresses
ZabaSearch
Free People Search and Public Information Search Engine