Purple Cow by Seth Godin
Overlap by Sean McCabe (You can read it for free at overlapbook.com21)
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How to Get Rich by Felix Dennis - The most real and raw business book I've ever read.
A book on getting rich by someone who's actually gotten rich. And he didn't make his money by promising to teach people how to get rich, either. He made his fortune as a magazine publisher.
If you're sick of hype-y, feel-good, woo-woo fluff, this book is like a blast of fresh air.
Here's a mini list of mine so far. I need to think more about this because I'm not remembering a lot of them: