Creativity, theory and productivity resources:
I first heard about Twyla Tharp in the eighties. Immediately impressed by her work, then decades later
Merlin Mann (43 Folders ) recommended her book about her creative methods. Definitely worth a look for insight into the thought processes of creativity.

Art is the only way to run away without leaving home. ~ Twyla Tharp

“What makes someone creative? How does someone face the empty page, the empty stage and making something where nothing existed before? Not just a dilemma for the artist, it is something everyone faces everyday. What will I cook that isn't boring? How can I make that memo persuasive? What sales pitch will increase the order, get me the job, lock in that bonus? These too, are creative acts, and they all share a common need: proper preparation. For Twyla Tharp, creativity is no mystery; it's the product of hard work and preparation, of knowing one's aims and one's subject, of learning from approaches taken in the past. It's a process undertaken every day. It's a habit. The Creative Habit is not merely a look inside the mind of a remarkable woman with remarkable skills, but a programmatic, inspiring, encouraging guide to help each of us achieve our fullest creative potential.”
Out of Our Minds: Learning to be Creative