[Gary]'s built some nice AVR projects. The most interesting is the charge controller/monitor he built for his EV Porsche. Each board controls a charger - with one charger per battery. When the system isn't charging the batteries, it provides real-time data to a VFD display in the dashboard of the 1978 Porsche 924. Hopefully he'll notice the spike in traffic and will update the charger project page.
http://www.hackaday.com/2007/04/30/avr-modified-ev-charger/