I've been considering putting up a wiki to start a collection of code samples for the Interface Surgery sections in the book, and for the Design Stories series on my blog, but the wiki software I've seen isn't exactly making me jump for joy.
I'm not sure what you're looking for in Wiki software terms. Are you trying to host it on a specific domain? Do you need to protect specific pages? There are so many Wikis to choose from it's good if you can specify what you need.
Have you tried PbWiki? The free version is reasonably good and you can upgrade it for more facilities.
Ideally, I'd like to host it on my own (hosted) server as opposed to using a subscription service.
I have tried PbWiki, and while it was decent, what I really want is to find a wiki good enough that I'd use it as an example in my next book. :) I know, I know, I'm pushing my luck.