The Know-It-All by A. J. Jacobs

The subtitle of this book is One Man's Humble Quest to Become the Smartest Person in the World and he does a great job chronicling his reading adventure.

Jacobs attempts to read all of the volumes of the Encyclopedia Britannica and relays humorous stories related to the topics at hand.

There is also a "preview this book" tab where you can start reading it online.

Here is a review of the book and I have a copy of it, so if you don't want to buy it, let me know and I can let you borrow it!