Open source hardware board
Nixduino is a convenient and affordable solution for an open platform to run Linux. Developments of Nixduino were used in the project Celebrity.
Application options vary, since you can connect keyboards, headphones, flash-drive and etc. For example, one of the developers used Nixduino as an mp3 player. As a prototype there were realized devices for building into the automobile headrests, which are adapted for playing various media files.
If you plan to introduce some extensions of the architecture - board is completely compatible with Arduino.