NTSB (National Transportation Safety Board, USA) - these people are in charge of the air crash investigation.
TWA's website [broken link]
The FBI's homepage (Note: the FBI concluded that no criminal activity was involved)
Official Montoursville Flight 800 Page [broken link]
Constance Cointer, an obituary [moved]
Clara Sherley-Appel's thoughts about Ana
Andrea Norstad's essay on CNN's website
Chris Kadlec's site about TWA 800
Laura Troxell's Page (about Pan Am 103 and TWA 800)
Boeing (manufacturers of the model 747 aircraft)
Aviation Safety Net (a superb website about air safety, and a link to a forum)