The RPi LED array is a printed circuit board that mates directly with the GPIO (general purpose input/output) headers of a Raspberry Pi computer. This module adds a 10 LED array that can be controlled by software however you'd like. The Raspberry Pi GPIO can be accessed and controlled by many different languages, and code examples can be found at: http://elinux.org/RpiLow-levelperipherals
More information, including Eagle files and a shell script for testing can be found in my Github repo: https://github.com/prizepony/rpi-ledarray-eagle
Feel free to contact me if you have any questions or are interested in getting your hands on one!