I honestly wish you the best of luck in this endeavor, but I feel compelled to offer my humble advice...
It sounds like you're putting together one of those books that just enrages me when, after spending around $50 to gain some knowledge, I find out that the author(s) know even less about the subject than I do. You're asking for free contributions and you're going to get what you pay for.
The best books are written by people who feel that they truly have something to say, and decide that a book is the best medium with which to get their message across. You're doing it backwards; you want to sell a book, so you're now searching for something to write about.
This doth not a bestseller make.







