http://www.cleantechblog.com/2008/01/sm ... icles.html
Actually makes quite a bit of sense because it will solve the problem of a lot of wasted electricity, only trouble there is if everyone was doing it the rates at night would rise to those during the day.
Here's another article: http://www.groovygreen.com/groove/?p=1782
According to a recent U.S. Department of Energy study, there is so much excess energy on the U.S. grid nightly that if every light-duty car and truck in America today used plug-in hybrid technology, 73 percent of them could be plugged in and “fueled” without constructing a single new power plant. So much for the myth that electric vehicles will cause more emissions.