@Clint:I was meaning the hardware interconnects. Release the interconnect standard (what pins, SPI, I2C, PWM IO etc) are on which connector type under something like the new OSHW definition. This would be really cool if you could get others building addons.
The real advantage to me of this over the Arduino connector layout is how easy it is to attach say three cameras to the same board. It really makes it easy to slap some hardware together to try something out.