Cloudman.Com http://www.cloudman.com/
Coud photos and charts, weather facts, and the history of Luke Howard, 18th century scientist who first developed the nomenclature for clouds.
FlightBrief http://www.flightbrief.com/
Complete aviation weather information and flight planning, with a free trial for pilots. Specialized weather forecasts made daily combining the talents of well seasoned meteorologists backed with the best systems technology.
Intellicast http://www.intellicast.com/
Worldwide city forecasts, detailed radar, NEXRAD and satellite images. Also, Ski area reports and forecasts, and Dr. Dewpoint's weather articles.