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A comment on Ask HN: What to do with a Raspberry PI?.
http://www.thinkythings.org/obdii/
http://icculus.org/obdgpslogger/obdsim
http://freediag.sourceforge.net/
Hackaday's RPi projects:
http://hackaday.com/tag/rpi/
http://www.thinkythings.org/obdii/
http://icculus.org/obdgpslogger/obdsim
http://freediag.sourceforge.net/