BlinkyTape is an LED that with an integrated microcontroller. It's one meter long and has 60 RGB LEDs which you can address individually. You can use the Arduino environment to program it, or use your computer to interact with it.
We have some documentation that we've prepared to help you with it, and you'll find most of it at http://www.blinkinlabs.com/blinkytape/
So, hang out, discuss, and have fun!