Accessible at http://c2.com/wiki/history .
(Proposed WikiName for use in discussing the above URL.)
From EditCopy:
This site is now keeping additional history beyond that offered by EditCopy. Volunteers who take care of the occasional lost page will find some old pages stored in plain text at http://c2.com/wiki/history. I intend to limit their retention to only a few days. -- WardCunningham