I was just browsing the 1976design blog and I'm amazed at what Dunstan has done with his realtime weather panorama images for the header of the site.
Redrawn from actual photos of the view from his location in England, an XML feed from weather.com triggers the correct image -- detailing time of day and whatever weather condition is actually occurring at that moment. What a brilliant idea, and I'm amazed at the detail -- moon phases?! Zodiac signs?!
More is explained on the Colophon, with original photos before they were redrawn as well as listings of every possible weather condition. And be sure to expand your browser window to reveal the entire scene. I'm impressed.