These are some of my favorites:

Six Chuter Info

• Six Chuter Powered Parachutes

Flight Planning / Weather

• AirNav
• FlightPrep
• Historical Map and Chart Collection
• Our Airports
• SkyVector
  
• VFRMap
• True Airspeed Calculator
• Windy

Experimental Aircraft Association

• EAA Chapter 90
• EAA National
• Airventure
• Golden West
• Northwest EAA Fly-In
• Sun-N-Fun

Fun Stuff!

• FlightAware – Track any IFR flight from beginning to end
• FunPlacesToFly – Great places to go in and out of California
• GoogleGeoCoder – Find the latitude and Longitude of anyplace on a Google Map
• Google Overlays – US Airspace and Aeronautical charts overlays for Google Earth!