David, from 37Signals, talks about motivation:

When you’re not working on something you’re inspired by, your efficiency is so much lower. You find more moments in the day to let yourself be distracted by email or reading on the Web or something else. That’s usually the key smell I detect when I’m working on something I don’t really want to be working on: I check email much more frequently and I engage in chats about things that aren’t related to what I should be working on.

You could hate on the 37Signals dudes with all their inspirational talk and books, but they run a profitable company based on their beliefs.
They walk the walk.
(I was going to say they eat their own dogfood, but that’s such a negative analogy)