Check out this outliner/eBook publishing software produced by the developers of SyncBack. I really haven't used it much (although I purchased it 9 mos. ago.) It had some performance issues, including screen-flashing when users changed topics, but it seems more responsive now.

http://www.2brightsparks.com/infohesive/index.html

The press release on the forum is here: http://bit.ly/9X61Ee

Glen