XWiki looks like a package I'd like to try. I think I've always regarded my weblog as a personal knowledge base, like a Wiki. Versioning could be useful, but the weblog trackback/comment web has intriguing uses as well.
The XWiki sites I've seen look very nice, in that the maintenance/admin functionality doesn't get in the way of the real content. I'll probably download, install, and play with it sometime soon.