I'm in two minds about wikis. Having experimented with wordpress, it's clear that it isn't WYSIWYG and it is a little bit like the early days of the net with html, i.e. you still have to learn a bit about formatting. We were hoping to create a procedure manual, (like the Antioch University one) and spread the load of creation amongst many people rather than having one person do the lot, but wordpress was a little hard to use and the help files weren't that helpful. I'll download mediawiki, have a play with it, and see if that's better, more user friendly for the work context.
PB Wiki is pretty user friendly. I've just setup one fairly quickly and simply for my TAFE Consumer Behaviour students so they can access documents, links etc relevant to the course. However, it only allows 10mb of space. Wetpaint has a bit too much advertising. Wikispaces has 100mb of space for your wiki and docs. Zoho has the best interface and toolbars but the help page has tons of unanswered questions dating back months so that doesn't auger well for the future.
St Joseph County Public Library Subject Guides is a neat idea.
If you want to collaborate (with the public or colleagues or both), then a wiki looks like the way to go. If you want to do it cheaply, then a wiki is also the way to go. Website management software is not cheap. If you want to do it and bypass your Council IT people, then a wikispace could also be the way to go.
Like the ask a librarian instant messaging service using the various free messaging services, though. What a simple and direct solution.
Wookiepedia!!! Boom. Boom. Love it. Check out whiskipedia, too.