charpi:
Yes I agree, but since this is a starting project I plan to be simpleFrom the documentations it seems that it has 2 ADC pins and 1 digital. I plan to use the 2 ADC pins to hook up 2 button arrays (of 2 buttons each) and a single reset button for the 1 digital pin.
At least I know I ordered the right components.
The link you supplied was for the Rainbowduino v3.0 I think it was the older version that had the ADC6, ADC7 & PD2 pins free. The v3.0 board does break out SDA, SDL, CTS, TX, RX & DTR but I could not find a schematic to determine if these are connected to the atmega chip or some other support chips on the board.