How to foster intrinsic motivation in a software team [closed]

Question

Jeff Atwood's blog post on Amazon's Mechanical Turk suggests that it should not offer monetary rewards but rather intrinsic motivation, "motivation that is driven by an interest or enjoyment in the task itself, and exists within the individual rather than relying on any external pressure."

How does a team member (a manager, a lead, or a developer) foster intrinsic motivation in a software team?

EDIT: Please provide comprehensive answers. Share your personal experience with objective analysis.

EDIT #2: To facilitate a productive and on-topic discussion, we should assume that monetary compensation is satisfactory to the developer.