I just found this interesting… Steven Brust is an established fantasy author, and from what I’ve heard from those who have encountered him a genuinely nice person. I own a number of his books. His was one of the very first author Web sites I found on the Internet in the early days, and he even responded to an email I’d sent. ^_-
Joss Whedon created a really, really excellent sci-fi series called Firefly (as well as the full-length feature film that followed it, Serenity). Brust wrote a Firefly fan novel- because… well, he just had to. He licensed it under a Creative Commons license. The discussion on Boing Boing brings up all kinds of interesting questions about derivative works, acts of sharing, and acts of creation.