NTSB Accident Reports: Find briefs and specify searches using different options through this form based interface.
Reports/Alerts: from NTSBs to FAA databases (such as FAA Continued Airworthiness Information, etc..), to NASA ASRS Callback Program and others, here you'll find lots of related information.
NTSB - Accident Synopses: Organized by month and year (FAA).
FAA Incident Data System (FIDS): A large collection of records of potentially hazardous events not included in the NTSB.