Everyone has seen Raspberry Pi Computer, the credit card sized mini PC circuit board that cost only $35. Now there is a new Mobile Raspberry Pi called Pi-to-Go. Mini LCD, 10 hour battery, and 64GB SSD hard drive. You can 3D print your own case and build your own. Complete instruction on how to build this Pi-to-go computer can be found here: http://blog.parts-people.com/2012/12/20/mobile-raspberry-pi-computer-build-your-own-portable-rpi-to-go/
Video of it in action
https://www.youtube.com/watch?v=E89s2h9swIc