Here are a few of the links that I use.....

National Mosaic - Full Resolution
[link to radar.weather.gov (secure)]
GeoColor: GOES East
[link to www.weather.gov]
United States Weather Radar
[link to www.accuweather.com (secure)]
Atlantic 2-Day Graphical Tropical Weather Outlook
[link to www.nhc.noaa.gov]
Australia > Radar Images
[link to www.bom.gov.au]
Network for Lightning and Thunderstorms in Real Time
[link to en.blitzortung.org]
Tropical Cyclones ...A Satellite Perspective
[link to tropic.ssec.wisc.edu]
Northern Hemisphere Enhanced Infrared
[link to www.weather.unisys.com]
NOAA West Coast Rainbow IR Ch4
[link to www.ssd.noaa.gov]
Real-Time U.S. Composite Satellite Animation - Large
[link to www.ssec.wisc.edu]
Intellecast Local Weather
[link to www.intellicast.com]