I just bought this book on the basis of an article I read at CNN.com. It goes to one of the principles in my book: employees want and need to be rewarded, and the rewards to you for positive recognition are just about unlimited.
Do your managers regularly recognize good performance, or are they ignoring good performance with the expectation that 'that's what they're supposed to do'?
Positive recognition - and knowing how and what to praise for - is essential. Make sure it's happening.