The current weather forecast for the United States
More information regarding this picture at Intellicast Inc.
The best place to look for weather information is WXNet at U of Michigan. Their list of weather resources is the most comprehensive list I've seen. Great work!
But how about the weather where I come from? Unfortunately almost all cool weather links relate to the USA but Radar Electronics AB in Göteborg has set up Swedens first weather radar available for the public on the Internet. It provides (almost) live radar pictures for Göteborg and a 128 km (80 mi) radius.