Discreet Research
http://www.discreetresearch.com/
A remarkably large database to secure Social Security numbers, dates of birth, name searches, employment histories, background criminal searches, unlisted phone numbers. You can order online, by, fax, or by phone. Minimal cost per search.
Ameridex Information Systems
http://kadima.com/
Ameridex presents a unique database for people tracing on the Internet. This database consists of over 380 million names, 300 million with date of birth compiled from multiple public and publicly available record sources. Your queries are answered within seconds. Query criteria is very flexible including pattern, soundex, date of birth range, and first or last name only searches. An online services price list is available.
KnowX
http://www.knowx.com
Charges apply to some searches. A few, such as professional license searches, death and marriage searches, are free. Ability to conduct background searches, search court records for bankruptcies, judgments, liens.
Black Book Online
http://www.crimetime.com/online.htm
Many free search sources. Some fee for service, with a 30 day free trial. Arizona specific searches, and nation wide. Birthdays, reverse phone and address directories, county public records, and more...
Social Security Death Index (Ancestry)
http://www.ancestry.com
Provides many interesting leads for tracing your family history. Among the most valuable may be the search of the Social Security Death Master File (you can find it on other Web sites, as well). The SSDMF is not comprehensive; it contains only those deaths reported to the Social Security Administration. In some cases, such as with homeless people and other situations, deaths are not always accurately reported.
Locate America
http://www.locateamerica.com/
FREE People Search, by name and by Social Security Number. Although first and last names are required, you may enter one or both, to receive a listing of potential leads. Pay for reports available, by request, including: most recent address, past addresses, age, alias and other names (married/surname), possible unlisted phone numbers, properties, deed transfers, legal actions, bankruptcy/tax liens, death records, incarcerations, and sex offenders.
Cemetery Listings Nationwide
http://www.interment.net is a searchable database of burial listings at thousands of cemeteries in the United States and abroad.