Yet another suggestion: the teensy, which has similar specs, but a smaller form factor, native USB support (last time I checked, Arduino used a USB - RS232 adap

Yet another suggestion: the teensy, which has similar specs, but a smaller form factor, native USB support (last time I checked, Arduino used a USB - RS232 adapter), and more pins (for the teensy++ version). http://www.pjrc.com/teensy/ http://www.pjrc.com/teensy/ A drawback is that the form factor isn't compatible with the Arduino shields (hardware extensions).