designed as open source hardware,

The Chumby is designed as open source hardware, with schematics, PCB layouts and packaging/outerware designs available. Hardware specs are as follows

350 MHz ARM9-based Freescale i.MX21 controller
64 MB of SDRAM
64 MB of NAND flash ROM
320×240 3.5 inch touchscreen TFT LCD running at 12 frames per second
stereo 2 W speakers, an audio output, an integrated microphone
two USB 2.0 ports
integrated WiFi
a bend sensor for squeeze-based user interface features
motion sensor (accelerometer).

Hacks
Hacking the Chumby hardware is encouraged by the manufacturer. Schematics and other hardware information may be downloaded after the user agrees to the Chumby HDK License. For example, users on the Chumby Forums have experimented with and documented some battery hacks, allowing the Chumby to be operated without AC power for short periods of time.