I can't say I fully digested this ... but it sounds a bit like the "XML Wikipedia" thread a month or so ago.
Leigh Dodds has offered to host prototypes of this kind of thing on his http://weblogs.userland.com/eclectic/
site, as I recall.
The technology is probably not the issue, it's devising a process that motivates people to contribute yet keeps the hype and spin and flames to a minimum that's the challenge, IMHO.
From: PaulT [mailto:firstname.lastname@example.org]
Sent: Wednesday, November 28, 2001 10:43 AM
Subject: [xml-dev] XML Buzzwords. RFC