http://adds.aviationweather.noaa.gov/: Aviation Digital Data Service (ADDS)
http://www.runwayfinder.com/: Zoomable maps, sectionals, satellite images with METARS and airport info
http://www.wunderground.com: Real-time radar images and more
http://www.rap.ucar.edu/largedrop/base.gif: Icing reports
https://www.fnmoc.navy.mil/PUBLIC/: Navy weather data (world-wide)
http://www.aopa.org/members/wx/: AOPA Weather (membership required)
http://cirrus.sprl.umich.edu/wxnet/wxcam.html#WxCameras: List of Weather Cams
http://www.faa.gov/asos/asos.htm: Automated Weather Sites, AWOS and ASOS
http://weather.noaa.gov/: NWS Internet Weather Source
http://www.airnav.com/: Airport data, navaids, fixes, fuel pricesv
http://www.airstripamerica.com/: Airport Database with photos and lodging info
http://www.aopa.org/members/airports/: AOPA airport directory (membership required)