I recently read 'The Lean Startup' and 'The Ancient Art of Stoic Joy'. I would recommend both books.
I think 'The Lean Startup' is not just a good read for startups in the usual sense; it's also a great advise on how to handle personal projects.
With regards to 'The Ancient Art of Stoic Joy' I think the stoic view of life is great and fits well into our western mindset while still being somewhat 'zen' like. I plan to read Marcus Aurelius' Meditations at some point since it's a bit like a diary of a stoic.
I will soon start with 'Colorless Tsukuru Tazaki and His Years of Pilgrimage'[0] which was recommended in a previous HN thread.
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[0]: http://en.wikipedia.org/wiki/Colorless_Tsukuru_Tazaki_and_Hi...