Robert E. Breiling Associates, Inc.

Provides accident reports and analysis on business aircraft, jets, and helicopters.
http://www.breilinginc.com/

FAA Incident Data System (FIDS)

Search for aircraft accident incident reports, from the U.S. Federal Aviation Administration.
http://nasdac.faa.gov/asp/fw_fids.asp

Major Airline Disasters

Database of major commercial airline disasters from 1920. Includes dates, locations, and plane types.
http://dnausers.d-n-a.net/dnetGOjg/Disasters.htm

National Air Disaster Alliance Foundation

Attempting to raise the standard of safety, security and survivability for commercial aviation passengers and for support of victims' families.
http://www.planesafe.org/

NTSB Aviation Accident/Incident Database

Aviation accident data and causal factors.
http://nasdac.faa.gov/asp/fw_ntsb.asp

Plane Crash Information

Aviation accident database with brief analysis and links to official determinations. Voice recordings, aircraft specifications, statistics, sorts by carrier or aircraft type, links and reference.
http://www.planecrashinfo.com/

Aviation Safety Network

Resource centre for airliner accidents and civil aviation safety issues.
http://www.aviation-safety.net/

AOPA Air Safety Foundation: Accident Analysis

Accident database (since 1983) as well as special reports, publications, and statistics provided by the Aircraft Owners and Pilots Association.
http://www.aopa.org/asf/accident_data/