I really enjoyed and got value from books about companies/people I admire; Hatching twitter, In the Plex, Elon Musk, etc.
More specific topics, however:
* "what every body is saying" - how to read/understand body language
* "an astronauts guide to life on earth" - by Chris Hadfield, lots of good general advice
* "speed reading" - for digesting information quickly (albeit, I find with less depth)
* "The 8 traits successful people have in common" - kinda painfully obvious advice, but often it's the context and stories that help you digest a message
* "the lean startup" - wasn't mindblowing but looks aligned with what you've been reading, still worth reading.