TimW writes -
It seems like MAKE is fond of arduino projects, so here is my contribution. Here is 4 cheap $1 displays mounted in a picture frame and hooked to and arduino. Using just 6 pins, I am able to individually control 552 leds. I wrote a bit of code to write a series of messages to the displays. This code listens for serial data to update the displays. Any text can be shown, but I am currently using a perl script to send the weather forecast from google to it.
Arduino powered weather station – Link.