Intellicast NEXRAD Data 
National USA radar image, map. Updates twice per hour. Links to other radar maps: Summary, Regional, Local NexRad, Storm Relative Mean Radial Velocity.
http://www.intellicast.com/Local/USNationalStd.asp?loc=usa&seg=LocalWeather&prodgrp=NEXRADimagery&product=BaseReflectivity&prodnav=none&pid=none
Live Weather Images 
NEXRAD images directly from the National Weather Service covering the United States.
http://www.weatherimages.org/radar/
Plymouth State College NIDS Data 
Free and regularly updated NEXRAD radar data. All NEXRAD sites are available on the site and several radar modes are offered as well including Base and Composite Reflectivity, Base and SRM Radial Velocity, VIL, and Storm Total Precipitation.
http://vortex.plymouth.edu/
WeatherMatrix Radar Supersite 
The WeatherMatrix organization, formerly CASI, has put together a nice collection of radar-related links. The links range from those to current radar data, to links about radar sites and how they work. StormMatrix, a very unique feature to the Internet, i
http://www.weathermatrix.net/radar/
WeatherTAP 
Commercial site offering NexRad Doppler Radar maps, updated every 6 minutes, including national, regional and state radar maps, and lightning strike data.
http://www.weathertap.com/unprotected/static/services_about.html
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