Well, what I'd like to see in addition to the above is the functionality of the DataQ thing I mentioned earlier. A bunch of analog inputs so I can hook up all kinds of sensors, like for example variable resistors, industrial grade pressure transducers, temperature sensors, 4-20mA current loop and 0-5V devices, that kind of stuff.
The serial output could be something like this:
timestamp, analog in 0, analog in 1,... digital in 0, digital in 1, digital in 2, ...digital out 0, digital out 1, digital out 2...