Nick Hall’s made this very excellent time & temperature display – complete with weather animations –
The project uses 4 RGB LED Matrix Modules from Sparkfun Electronics, and is controlled by an Arduino microprocessor board with 16k RAM and Ethernet shield for internet connectivity to get time and weather data.
The Arduino and LED modules made it pretty easy to stick together. I just need to find a cool box to put it in.
I am working on getting it scrolling tweets and messages!