timeanddate.com has a great weather viewer. Just wanted to say that. wunderground.com has turned into an awful mess since IBM bought it, did a poor web 2.0 treatment on it, and now I think accuweather (who effectively has a monopoly on weather data) bought them? weather.com is full of ads, as is any other weathre website these days. for whatever reason.

timeanddate.com has a clean, fast interface, and if you don't like ads they have an ad-free option