Having a 30 minute subway commute I'm looking forward to seeing what suggestions come out of this thread. My two suggestions:

1. Thinking fast and slow - Understanding how we actually think as opposed to how we think we think is a critical skill, especially in a startup. Having a Nobel prize winner explain how the two systems of your brain work together (and can sabotage you) was enlightening and enjoyable. This book helped me understand many aspects of design and sales that had been black boxes for me

http://www.amazon.com/Thinking-Fast-Slow-Daniel-Kahneman/dp/...

2. Art and Fear - This is a book nominally about the relationship between artists and how they go about making art but it is useful for anyone creative. It's about how to go about making when you have errands to run, a deadline, or just don't feel like it. As a dev I found it inspiring

http://www.amazon.com/Art-Fear-Observations-Rewards-Artmakin...

Is this the Art and Fear book you're referencing? I searched Amazon and found a few.

http://www.amazon.co.uk/Art-Fear-Observations-Artmaking-eboo...