Orbiting the Giant Hairball (1998) was a great guide to being creative in a world structured to squash creativity: http://www.amazon.com/Orbiting-Giant-Hairball-Corporate-Surv...

Hugh McLeod's How to Be Creative manifesto (2004) is also an amazing guide http://changethis.com/manifesto/6.HowToBeCreative/pdf/6.HowT... (you can buy it too http://www.amazon.com/Ignore-Everybody-Other-Keys-Creativity...)