Weather resources
Standard briefing	NOAA's page with links to the tools used in a standard briefing, including surface analysis, pireps, constant pressure charts, and more.
weather.unisys.com	Weather maps including upper air data and aviation model forecasts. Also lots of info on interpreting these charts. For example, click on map for local (consumer) forecast, or click on the GFS/Avn model link under "Forecasts" for medium range forecast maps useful in aviation. Click the sample map and then select from the menu at the top of the resulting page.
USAirnet.com	Hourly surface forecast at DXR (other locations available) prettied up from the National Weather Service's Aviation Model. Main site has other air sports info.
ADDS weather	Aviation Digital Data Service. Includes icing potential charts at various altitudes. Really cool.
ADDS icing	The main icing page of the ADDS.
Lightning strike map	Map of lightning strikes for the entire country, for the last several hours, color coded to help track storm movement.
NOAA graphical forecasts	Interactive map showing many different forecast elements (temp, precip, wind, sky cover, etc). Just hover the mouse over an entry and the map displays the forecast. Much more available at the site.
US-Radar	Hi Res radar loop of the entire US, from srh.noaa.gov.
TWC radar	Near-live radar and radar forecasts from The Weather Channel (Danbury CT at this link). The interactive part requires flash and displays the radar and clouds over aerial photos. You can drag the image (center what you want under the crosshairs) and then zoom in. Site contains popup ads.
Northeast Leaf color and drop map	A map of the Northeast's fall foliage colors and another of leaf drop, from foliagenetwork.com. Other areas and past archives available too.
Northeast Leaf Peeping map	A map of the Northeast's fall foliage colors, from weather.com. Other areas, past archives, and more inside.