Well, the US Army has one:
[link|http://www.foxnews.com/story/0,2933,39349,00.html|http://www.foxnews....9349,00.html]
Granted, it seats fewer then the movie's version, but it also includes features from the Batmobile, KITT, and most of James Bond's autos.
Other than the gas mileage, I think it would be pretty nifty in a commute.
Brian Bronson