I thought I would mention the most fun I've had playing on Ubuntu. A company that makes a Quad helicopter that sells for around $300 uses Ubuntu for much development. They offer an open source API that includes a flight control program so you can fly the drone using Ubuntu and a joystick or game controller. I already compiled the example control and it works great on my Ubuntu, it is so cool and fun!
A YouTube video showing Ubuntu/joystick compile and flight:
http://www.youtube.com/watch?v=Oe6jbNdF35s
The API developer forum:
https://projects.ardrone.org/
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