I was just discussing with a friend yesterday about the rise of wikis, especially in corporations. My cynical take is that, at least in the context of his company, they were little more than easier to use Lotus Notes databases. Where he works, the I/T side of the house has made it so painful and difficult to set up a Notes database, that wikis are taking over as the place where people can have informal discussions and store informal documentation. Anyway, via the del.icio.us/popular feed, I found: Wikiphilia - The New Illness

Wikiphilia: A mental illness characterized by the irrational conviction that any problem faced by a group can be rendered solvable through installation and use of a Wiki. This delusional ailment has been occurring in increasing numbers ever since it was first identified in 1995. Wikiphilia usually manifests in two distinct phases - the rapturous anticipation of the Wiki's potential in the short post-installation phase; slowly giving way to denial of the Wiki's failure to fulfill that potential in the second phase.