Official

OHS Overview Document by Doug Engelbart.
The idea behind the Open Hyperdocument System, straight from the man himself

http://www.bootstrap.org/augment/AUGMENT/132811.html

http://www.bootstrap.org/augment/AUGMENT/132082.html

 
Endorsed by Doug

Nodal.

http://www.fleabyte.org/morgue/alliance-980.htm

 
Other

Delta-V Working Group
http://www.webdav.org/deltav/
IETF Delta-V Working Group Extending the Web with versioning and configuration management. DeltaV protocol specification approved as Proposed Standard. Five and a half years ago we began working on the vision of the Web as a writeable medium, one that could be used for remote collaborative development of software projects, large documentation efforts, and other large clusters of inter-related information. With approval of the DeltaV protocol as a Proposed Standard, we have taken a large step towards making this vision a tangible reality.