Inspired by 
Robert I thought I'd write about the history of Phpwiki powering this very blog.
Why use a heavily costumized version of Phpwiki as a blogging software and not stick to its default theme or even choose one of the major players?
When I started blogging in 2001 I had my own "journal" done with static HTML. Mid of 2002 I started to experiment with Wikis, my first running implementation was called artefact. So that was some time before the rise of open source blogging giants like Wordpress.
In 2003/04 I examined some blog software. I was especially disappointed by Wordpress. Not because of its functionality, but because its code seemed to be a mess. Don't know how that looks today, but that made me stick to Phpwiki. I modified it to support Ping-Services, RSS-Feeds (Phpwiki supported RSS but not in a way I wanted it to), Comments (same here) and Tags. (And some secret text mining based SEO stuff, but that's another story). Look here for an archived version of one of its first incarnations. It still like its look. It's usage was and is quite archaic, but ok for me.
However, I wouldn't recommend it for anyone else. But still I'm convinced of the potential of wiki software as general publishing systems.
Finally, here are some links to other posts with thoughts regarding blogs and wiki.