I've been pondering the problem of expanding the number of channels for the UAVDev Board. I think it is possible to have eight input (radio) channels, four output (servo) channels, an altitude (pressure) sensor and an airspeed (pressure) sensor without any modifications to the board. It would require some code changes but I don't think they are difficult.
Would it be necessary to add these items? The board would plug on top of the existing headers and would be about half as big as the existing UAVDev board. Is there any interest?