I sought help when my depression was getting too much to bear and nothing else seemed to be working. After some research, I stumbled upon meditation again, and I say that since I used to "meditate" during Tae-Kwon-Do classes when I was a kid. I figured it'd at least get me back in touch with it, as I do remember it helping.
I was amazed by the sheer amount of instruction this book contains. Matthieu Ricard makes a complete effort that addresses basically any question a beginner may have with what meditation is and how it works. First, he describes the practical ways (backed by scientific studies) it helps. Then, he gets more into the spiritual side, how it's supposed to work, and what you're supposed to do and expect. He does an excellent job putting a complicated thing like meditation into layman's terms without having it lose any of its deep meaning. He even includes some figures and examples to keep you on the right path (even if you haven't done it before) and make sure that you understand what meditation is.
The interesting thing is that I've taken real meditation classes as of recent in well-known places such as Tibet House and I'm pleased to say that everything they teach in these classes are basically the same principles the book has. I never thought a book could teach something so well. If you don't have access to classes, this is almost as good (or even the same in my opinion). If you follow the book and practice, you can also get Tibet House quality instruction. Fear not, for this is the real deal, but the book makes it so easy a caveman can do it. The CD (that comes with the hard copy of the book) is a nice recap of the teaching of the book and functions like an audiobook, so you can take it anywhere you want to meditate.
I wound up buying this book more than once for some of my friends when they needed help going through some tough times like I have. I find it as one of the best "self-help" books out there in order to find your true happiness.