Here is a collection of links for those looking for useful and interesting websites for obtaining flight planning, weather briefing and accident database information.
Aviation Weather and Planning Sources
US Weather, Planning and Tracking Sources
NOAA Aviation Digital Data Service (ADDS)
CSC DUATS (FAA Certified Aviation Weather Provider)
DTC DUATS (FAA Certified Aviation Weather Provider)
AirNav.com (Airport & FBO Info and Fuel Planning)
FlightAware IFR Flight Tracking
International Weather and Planning Sources
Norweigan Internet Pilot Planning Center (IPPC)
Aviation Accident Reporting Sites
UK Air Accident Investigation Branch
