Why do we work?
This video explains some of it, with some surprising (at least to many economists and managers) results about how financial rewards aren't always productive.
http://www.youtube.com/watch?v=u6XAPnuFjJc&feature=player_embedded
http://www.youtube.com/watch?v=u6XAPnuFjJc&feature=player_embedded