Bill de Hora describes how to do faceted classification with a Wiki.

Nick Lothian invents the Fiki: a Wiki that automatically figures out where links should be created

Sam picked up on Elizabeth Lane Lawley's post on Wiki backlash, and a flow of comments ensued. The major issue that's come out of this for me is the ahistoricism of Wikis, or put another way, the non-traceability of a Wiki. If people are working intensely with each other, then a Wiki is fine, but as the process runs out over time, and more people join the conversation, it's nice to have a way to trace how you got there. Some Wikis let you see all the changes, but its kind of like reading CVS diffs. You can do it, but it's not always the best way to trace the flow of discussion and decision. We've been using a Wiki at the ASF, which is my first real use of one, and it's been successfull for small documents that don't link to each other that much. But for big documents or multi-multi page layouts like the pie/atom/necho wiki, it's tough unless you can devote attention to watching the changes every day. I've found the same difficulty with the OSAF Wiki. The OSAF Wiki is easier, because there are far fewer small edits. It tends to be (relatively) infrequent big updates of large sections. It's like you need an out of band channel to hold the rationale and traceability of what's happening on the wiki. What that out of band channel is, I'm not sure. But then you need a way to link them to achieve traceability.