Flight Planning Sites
1800WXBRIEF.com - Flight Service
NOTAM Search
GPS Outages
FlightPlan
AOPA iFlightPlanner - has some great resources
FAA Airport Details
Check out my Flight Planner under Trackers & Calcs
Reference Material
AC on Pre-Flight Briefings
ICAO Codes
see Downloads section for Flight Planning List and more
Worksheets
Navigation Log
Personal Minimums Template (FAA) or another from AOPA