I just finished reading Way of the Peaceful Warrior by Dan Millman. I had it on my reading list for a while, and several people recommended it to me.
The book definitely was inspirational, and I liked many of its Zen-like lessons, such as about paying attention to life, being happy for no reason, and appreciating each moment you have. It also demonstrated the hard work it takes to make real change in life and the value of good teachers. The book reminded me a lot of Zen and the Art of Motorcycle Maintenance; the fact that the teacher was a gas station attendant and car mechanic must have been an implicit nod to the Motorcycle inspirations.
What I didn't like were the several totally magical/fantastical/shamanistic elements; if these were brought down to earth and reality and explained as simple visualizations rather than as special powers of the teacher, I think it would have made the book lose less of its seriousness and value. Overall though, I did enjoy it and got many good ideas, inspirations, and butt kicks out of it, so it was all good.