ARM powered bot.
Your basic three wheel chassis with a ARM processor. The Freescale Freedom board cost me $12.00 US. They have a 3 axis accelerometer and support Arduino shields however will not supply +5 volts. I'm currenly working on a shell for the MQX-lite RTOS. I don't want to use the string library from libc because its a space hog. I am writing basic string fuinction that won't use much space. I will be able to comunicate through an USB port.