This piece about the Five Universal Laws Of Human Stupidity had me laughing out loud in a couple of places. It's more perceptive than funny, but still quite amusing, and explains a LOT.
If you're into spiritual growth, you've probably read the highly regarded, and frequently mesmerizing, Autobiography Of A Yogi. It's a classic that is still going strong at 75 years old. (The book, not the yogi.) I'm re-reading it now and stumbled upon this article about when and how it was written. Fascinating stuff.
More recommendations coming as they show up.