Kwiki has gained a great deal of popularity as a Wiki package, and while I was hesitant to accept yet another Wiki implementation with yet another slightly different Wiki markup syntax, it is now my wiki implementation of choice. It's still a bit new, with kinks expected of a 0.x release, but it has the cleanliness and underlying modularity that made Movable Type so popular with power bloggers. And just as MT attracted a community of hackers and modders extending the product, so has Kwiki.
Just the other day I conceived of a mod to Kwiki that would allow a node to have an automatically generated table of contents, with links to anchors of headings later on the page. Naturally, someone beat me to it, with an implementation so identical to the one in my head that I can't lay claim to it. It's just that good an idea, I guess. :) Thank you, Iain!
I have another couple of features I'd like to add, but I hardly have time to write about them here, let alone implement them myself.