Just watched a cool video of an EV retrofit kit. Cool because it's "as easy as changing your brake pads" with a target cost of "$3,000 out-the-door".
Video: http://www.youtube.com/watch?v=8jfU1CddhgM
Fact Sheet: http://www.mtsu.edu/research/docs/Wheel_Hub.pdf
More Coverage: http://www.hybridcars.com/news/tennessee-college-plug-hybrid-concept-seeking-commercial-backing-49303.html