How is a wiki to be used, what for, and why? Are there perversion of the concept (other than absurd commercializations like google-ranking gamers, etc).

I'm using a wiki-engine (www.pmwiki.com) for an (experimental?) writing project, plus notes: www.xradiograph.com/wrottings - most of the weirdness is in www.xradiograph.com/wrotting...MonaLisa, where I use the wiki-structure for easier editing and non-linear navigation of the text.

I started this up in April 2007, surprised that it hadn't hit me earlier [the basic abstract "style" started more than 15 years ago]. I wonder what else is going on out there, different ways of generating, presenting, etc.