One of the last non-fiction I seriously enjoyed was "Guns, Germs, and Steel: The Fates of Human Societies."
http://www.amazon.com/Guns-Germs-Ste.../dp/0393317552
I have no idea how well the Kindle version reads because the print version I read had quite a few interesting maps and charts. The Wikipedia entry on this book covers the criticism of this book fairly well. Still highly worth reading to me.
I also finally got around to finishing "Godel, Escher, Bach: An Eternal Golden Braid." That book is hard to read cover-to-cover. Too much cognitive effort and an amazing read. Huh, looks like no Kindle version available (
http://www.amazon.com/Godel-Escher-B...tt_at_ep_dpt_4).