TDPS - Private Security Bureau  - Information on Security and Private Investigation Laws

FAA Registry - Aircraft - N-Number Inquiry  - Aircraft Owner information

http://www.manta.com/  -  Company & Corperate Info & Profiles

People Search - self explainatory

http://pieducation.com/index.shtml  -  Private Investigator Continuing Education Courses

http://www.statewidetrainingacademy.com/default.asp  -  Security, PPO, PI and Other Training

http://www.gpsit.com/en/covertsurveillance.html  -  GPS Tracking Service

http://www.brickhousesecurity.com/  -  Gadgets - Check Current Laws before use.