I'd like to renominate PSJohn's
http://www.desertweather.com. John has done a lot of work on his site, and his clean design still makes me want to spiff up my weather site.
His site has consistent easy-to-use navigation, AJAX for swift updates, and I really like the innovative way he's using VWS's graphs and included Weather Display outputs as well.
John has also been a valuable member of the Southwestern Weather Network. He was the 10th member site to join the SWN, and take an active part in growing that regional network.
If you haven't checked out DesertWeather lately, give it a look.