Livin' In Mexico: The Real Story
by Brian Burke
This isn't really another a "how to live in Mexico" book, as much as it's about life choices, expats, Facebook, and even pirates. It's popular, well reviewed, so you may like it too.
The reviews say it all. It was written to try and describe what it's like living in Mexico, how it feels, the good, the not so good, the things you can expect, the things you would never in a million years expect.