The following are links to outlining essays and VO content written by Steve Litt:
"Outlines: The Do Everything Tool". This is an essay on outlining,
written in November 1999, before the existence of VimOutliner. It
discusses why outline, and under what conditions. Ironically, in this
document the eventual author of VimOutliner asks if anyone knows of a
Linux outliner project so he can join it.
"Vim 6: A Great Linux Outliner". Vim version 6, with folding, came out
in mid 2001. Folding enabled real outlining. This article describes the
original roots of what one day would become VimOutliner.
The original VimOutliner website. Contains the original project charter
which defines VO as a fast input system. Also, purely for historical
purposes, contains downloads of some really ancient VO versions.
"A Free Software Project Moves On". This describes the history of
VimOutliner from the time Steve Litt's seventh grade teacher taught him
to outline to the day Steve Litt passed the project on to Noel Henson.
Video of Steve Litt's VimOutliner presentation at LEAP-CF 6/19/2003.