This isn’t exactly new, but I wanted to post on it anyway. Library Thing is trying to get an open-source-like project for classification for to replace Dewey going. It’s called the Open Shelves Classification.
Back in my library days, I might have joined in–but not now. There is a forum for the project on Library Thing, as well as a wiki.
While Ifind the initiative interesting and with some potential, I wonder how they’ll ever arrive at top-level categories or even facts. Good luck to them.