Peter Schirmer has brought a new, awesome, meaning to mashups. He has created the concept of a weather clock. Instead of telling the time, this clock tells the weather.
How did he do this?
He used a fake antique clock that he bought on eBay. The clock mechanism was removed and replaced with a servo and USB servo controller so that the clock could be controlled from his computer. The face of the clock was designed to incorporate 13 weather conditions (cold, hot, fog/haze, cloudy, partially cloudy, sunny/clear, clear at night, rain/showers, sleet/freezing rain, snow, windy, thunderstorms, hurricane/tornados). The clock was then connected to a flash application that interrogated the Yahoo! weather API based on a specified postal/zip code.
Take a look at his site: http://www.thisispete.com/weatherclock.html