While developing on Jimmy the mouse bot I had the idea of a new "slimmed down" version of my Propeller development board. Sometimes less is more and you don't need lots of the ports the board has. So this would be more of a controller like board with only the Propeller, EEPROM, quarz and expansion headers to connect to whatever stuff someone needs. If this runs from 3V (two AA batteries) then even a power regulator should be not needed.
I think the power supply could be on a tiny single board as a module that can be plugged onto the controller board if needed. This would be a more modular approach I think.