I recently borrowed Go Green Live Rich: 50 Simple Ways to Save the Earth and Get Rich Trying from my local library. I do most of my non-internet reading by CD in the car. Several days a week, I confess, I am non-green as I have to make a 120 mile (round trip) drive. 'Reading' books during this time is an activity I truly enjoy.
Author David Bach has a nice little book here, although I doubt anyone will get rich reading it. I would say this book is great for someone just becoming environmentally aware or someone who needs a financial incentive shown to them in order that they might make Earth-positive changes in their habits. For a more seasoned Greenie, give it a flip through at the library before deciding to invest in this one.