Seth Godin

If you are a mourning Steve Jobs fan (as I am) and you have never read Seth Godin, you should start. He articulates the mindset of "think different". His recurring themes are: work as a platform for art, avoiding the resistance of our lizard brain, don't be a cog and generally just setting larger, smarter goals. His blog is great. His books read like a series of blog posts, are easy reads and full of insights. I am currently reading Linchpin, which tackles the topic of how to become indispensable in your career.