[Gibbon]

I second the war of art.. excellent book.

The classic book on creativity is "A Whack on the Side of the Head" by Roger Von Oech (http://www.amazon.com/Whack-Side-Head-More-Creative/dp/04464...). It is the book to read on creativity, along with his other book "A Kick in the Seat of the Pants"

His card decks (Creative Whack Pack, Innovative Whack Pack and Ancient Whacks of Heraclitus) are also very useful for breaking bad habits, generating ideas, divergent thinking etc. somewhat like Brian Eno's Oblique Strategies cards,which I recommend (http://www.rtqe.net/ObliqueStrategies/)

For more practical examples, exercises and inspiration, I like Creative Sparks (http://www.amazon.com/Creative-Sparks-Concepts-Exercises-Ing...) and Caffeine for the Creative Mind (http://www.amazon.com/Caffeine-Creative-Mind-Exercises-Brain...)

EDIT: I'd also recommend Organizing from the Right Side of the Brain "http://www.amazon.com/Organizing-Right-Side-Brain-Organized/... for tips on how creative types organize their workspaces. Handy if you're right brained, a pack rat, like "messy" workspaces or dislike the anal-retentiveness of Getting Things Done.