Superb song...though I havent heard the Sandy Denny version, regrettably, cos I'm a BIG fan of hers.....I post mainly for the benefit of Lox though, who posted about the Film in which Daniel Day Lewis sings the song.
The blurb about the Film (which is called 'Eversmile, New Jersey) can be found here:
http://uk.imdb.com/Title?0097302
(apologies for not knowing how to do 'Blue Clicky Things')