A book that gave me a good kick was The Pragmatic Programmer. It concentrates on the work process, from the point of view of people who never stop refactoring in their minds. Outstanding metaphors and pragmatic tips show how to realize that approach in your daily work.
See also footpads book review.

One of the first tips in this book: "Think! About Your Work".

^~Django
"Why don't we ever challenge the spherical earth theory?"