Drive is an interesting books that talks about what motivates us. Dan Pink goes through and talks about a lot of the studies on human motivation and behavior. Showing that the main motivation for people isn’t so much the if you do this you get rewarded if not you get punished. It is actually a drive for self control and interesting work to do.
Most of the book is focused on what motivates us in the work place. He makes reference to companies like Google and Atlassian and their 20% time. Which allows employees to spend 20% of their time working on what ever they want with who ever they want. This time actually produces many new products and a lot of bug fixes for existing products.
Dan also talks extensively about how work using this type of motivation is of a higher quality than other types. He makes reference to Wikipedia putting Encarta out of business, and the extensive use of Linux and other open source tools.