I've been using BeWeather Pro for a while and like it the best. Here are some of the features I like:
1. Compatible with Beautiful Widget clock skins.
2. Has three different radar choices, plus visible and IR sattelite.
3. Can have multiple locations, and with pro version, can select nearby personal weather stations from WxUnderground.
I have a PWS at my house, which is why I originally bought BW Pro, but it really is a nice widget.
Edit: wait - are you looking for a widget that also has a radar service, or are you trying to find an actual radar widget that shows radar all the time? I just re-read the op and seems I may have misunderstood the request.
That would be a pretty cool widget. Could be a data hog, but if it had some kind of refresh toggle built in, that would definitely be a useful utility.
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