Wiki is good for Collective Intelligence (or Stupidity) type tasks. There actually is a bit of discoursive nature about the whole thing as well.
I'd think that this group might be a good candidate for Wiki development as we're pretty well cohesed (to verb an adjective ;-), and have a fairly strong level of technical expertise. Not to mention we never shut up....
Feedback I'm getting from work is that the searchability of TWiki is something that's readily apparent, as well as the linking (both inentionally, which is pretty damned easy, and incidental, which is pretty damned slick) of content. I like the fact that, from wherever I am in the office, I can grab a browser and jot some quick notes in regard to a conversation, problem, solution, etc. There are also numerous plugins, and Wiki can be extended well beyond the basic "information repository" mode, though I've only just touched on what these opportunities are.