Treb: good link. You can buy the Arduino as a DIY kit to assemble as well, but I'm not sure what the price is.
Daox - that about sums up my position = interest + some programming ability.
Let's see if anyone else dives in. If not, I was thinking of getting myself an ar/boarduino anyway, just to play with.
EDIT: forgot to comment on the OBD2 issue - the nice thing about the MID is it's universal to any vehicle with fuel injection. I figure people who have an OBD2 vehicle would just get themselves a
ScanGauge anyway (unless this turned out to be significantly less money for equivalent functionality).