Briefly, ebooks-tree.com seems to be scraping content from a lot of sites including the archives and putting it on line; there appears to be some sort of charging system so they are profiting from fanfic without the author's permission.
This blog post describes what's going on and how to complain:
http://impishtubist.tumblr.com/post/116316699750/i-didnt-wanna-do-it-fyeahcopyright-weveOn a quick check I found Nan Smith's The Vampire Murders and several stories by Shayne Terry. There are probably many others.
