I'm using a combination of things now:
WeatherEye for the homescreen icons that change with each update; Weather
for info on multiple cities (up to 5) and a slick interface;
Weather Underground bookmark for long term (10-day) forecasts. I've actually been using the iPhone formatted pages from wunderground - you lose some functionality in the scripting and internal links, but the radar image is larger and the icons are nicer to look at than the lightweight mobile version that I used to use.
When all else fails, I just look out the window. But how much fun is that?