I'm considering making my book Bitcoin Hands-On! open source. By this I mean - posting the whole thing up on github.
Obviously I wouldn't make money that way, but I'd be able to mention it everywhere online, without seemingly blatantly promoting something that I'm selling. Also, I could request donations on github.
I would continue selling the book on Amazon, because that's often where people look first for information. And in the future I'll potentially sell an expanded version that could include things like support, personalized instruction, etc.
Any thoughts or considerations? What are some forums/groups that focus on open source?