Ask HN: What are your favorite ebooks? Technical or Not

I really enjoyed Sacha Greif's and Jarrod Drysdale's ebooks on design from about a month ago.

http://sachagreif.com/ebook/ http://bootstrappingdesign.com/

What are some other good ones? Technical or non-technical, any subject, let's get a good list.

  • I recently started reading JavaScript Enlightenment. It's great and free: http://javascriptenlightenment.com/

  • The Facebook Effect by David Kirkpatrick (The real story and not movie version of Facebook) very good