Academic paper on Wikipedia presented at CHI 2004:
"Studying Cooperation and Conflict between Authors
with history flow Visualizations"
http://web.media.mit.edu/~fviegas/papers/history_flow.pdf
(announcement of that paper may also be of interest: http://mail.wikipedia.org/pipermail/wikipedia-l/2004-March/014782.html)

Bill Venners of artima.com (http://www.artima.com) recently did an interview (http://www.artima.com/intv/wikiP.html) with Ward Cunninngham and asked what were Ward's goals when creating the wiki.
http://www.artima.com/intv/wikiP.html

"This case study explored the use of a wiki to support a group of artists in a rural location who were participating in a multimedia training course:"
"Wiki technology for a community of practice:
An open system for dynamic groups as a participatory design tool"
http://www.cs.tcd.ie/~jamesh/portfolio/meta/jamesh-meta2004.rtf (NOTE rtf format
)

For Publications about Wiki in a more comprehensive, better, annotated bibliography:
* http://usemod.com/cgi-bin/mb.pl?WikiPublications