There's a guy over on CloudyNights using one of these RaspberryPI's and putting OpenPHD guiding, GOTO, and Canon EOS capture software on it as well as SSH and X server, so using an iPad/Android or whatever he can control camera, guide, goto using SkySafari etc. Pretty cool:
http://www.cloudynights.com/ubbthrea.../o/all/fpart/1