Sometimes, the most difficult task at hand when operating a website is locating the documentation that helps solve a problem. For those of you who have been looking for a WordPress Multisite reference book to help get you started, Mika Epstein and Andrea Rennick have co-authored a book specifically for WordPress Multisite. The book contains over 40 pages of information ranging from installation to configuration. However, one of the more interesting aspects of the book is that the price tag is PWYW otherwise known as Pay What You Want. Mika suggests $5.00 but it’s not a mandatory amount. Since Sunday, she has seen over 500 downloads of the book while earning $150.00. With that said, the book has been released under a Creative Commons Non-Commercial license which basically means you can use it on your website, put it within the Codex, give it away to someone, but what you can’t do is make money from it. I encourage you to read her take on why she released the book as is.
I think one of the things worth taking away from this little experience is that code is GPL, text is not.