Greentech - Testing a Plug-In Hybrid Prius - NYTimes.com This is an interesting article mostly about plug-in conversion of a 2005 Prius. A likely deal-breaker for me: "Because of a quirk in the software marriage between the stock Prius and the plug-in system, it is necessary to stop completely, shut off the car and reboot out of all-electric mode should you want to go, say, 53 m.p.h." As for me, I'll wait for the 2012 (or later) factory-issued plug-in Prius...