Well, Jo is in court this week against the HP Lexicon guy, Steve Vander Ark. He wants to publish an HP encyclopedia and Jo and Warner Bros. are saying it's a copyright infringement. I'm with Jo on this one. Vander Ark is taking her work and trying to publish it and make money off of it. His website is nice, I like it, but this is crazy. He shouldn't be able to make money off Jo's work.
Here's a link to all the articles.
http://www.mugglenet.com/app/category/show/86

Vander Ark's encyclopedia is just a compilation of what's already been stated in the books and interviews. No new info or any of his own commentary. The whole thing is just Jo's work. So, I don't think he should get to make any money off of her work.