I came down with a serious case of Not Invented Here, and created a wiki of my own. Before you look, consider that:

• It doesn’t have a lot of the features that I want.
• It may be broken (I didn’t dedicate a lot of time to writing tests).
• Indeed, unless you’re the kind of person who likes to hack on things, you’ll probably seriously injure yourself if you so much as glance at it!

That said, I’d love to have a collaborator or two:

DedaWiki

It will eventually replace the wiki engine utilized over at http://www.leenooks.com, which is showing its age, and not as fun to work with as Rails at this point in time.