Today Intel and CircuitCo electronics began shipping their open-source Minnowboard enthusiast grade development board / microcomputer. Measuring in at just 4.2 inches square, the Minnowboard packs quite the punch. The mini PC runs an Atom E640 SoC with integrated GMA 600 graphics. 1GB of DDR2 RAM is present with 4MB of onboard flash memory there to store your microcode.
Storage is expandable via a microSD card slot as well as a SATA 2 port, with connectivity being handled by two full-sized USB ports, a single microUSB port, as well as a serial port, Gigabit Ethernet, and HDMI out. The Minnowboard features eight buffered GPIO pins, two LEDs that are controlled via an additional 2 GPIO pins, and 4 GPIO switches.
A system header is present for flashing new firmware to the device and the OS of choice appears to be Angstrom Linux. Intel and CurcuitCo have released the boards schematics, code and design files under the Creative Commons license. Those interested can pick up a Minnowboard from Digi-Key, Mouser, Newark and Farnell for $199.