Though there are several
Though there are several books out stating some of the same information, I would also point to the fact that there are millions of books on running shod, tens of thousands of books on how to do an ab crunch, etc. I don't feel that having a dozen barefoot books out is a bad thing. I've read most of them, some I think are really good, some aren't so good, but the great thing is that others wouldn't like the ones I did and visversa - thus the nature of books. The differences, often times, are in how the reader relates, personally, to the author: humor, analytical, stories, age specific, gender specific, ultra, casual, injury prevention, injury recovery, etc. - - most of what makes a book a good or bad book is the delivery.
A couple small notes on my particular situation, for what it's worth: I finished my book in the fall of last year and published it the first of December 2010. I wrote my book to try to help people out by discovering some of the things I had learned, things that surprised, shocked, and (most importantly) worked for me. I have a full time job, I always will, I'm not traveling to pitch my book or paying marketing firms, or anything else - if I make enough money to take my wife and my three year old out to dinner a couple times, I'll feel good about it.
My book is, and is not, a few things:
It does address the benefits of minimalist running, what to look for in minimalist shoes (and what to avoid), case studies on the injury rate of shod runners, etc. It also tells my personal story of being a NB/Brooks/Saucony/Asics shoe specialist and thinking barefooting was insane, to myself becoming a 100% minimalist runner.
However, that is part of the book. A large part of the books is teaching people to run, period (efficiently and injury free - breathing, cadence, how to run hills, what to do with your arms, head, body form, stride, etc.). See the book came out of a paper I wrote for fellow friends and coaches (I coach high school soccer) and as the demand grew and I got to see it helping more people, I decided to expand it and make a book out of it. The book, intentionally, does not have "barefoot" in the title.
And a big part of my book, and I guess what some would say makes it slightly 'different', is that mine is about my personal story of recovering from injury (over 1/2 a dozen knee surgeries - the last of which was supposed to render me unable to ever run again... which is how I came to minimalist running).
Again, just my small bit of input there, and remember, like all things, with input, you get what you pay for, and my input just there was free... you do the math