One of the things that sort of turned me off on wikis is their lack of programmatic control. For example, many weblog tools support a remote procedure call mechanism through XML-RPC. Similarly, Movable Type has a ridiculously beautiful Perl API.
But it looks like my wiki hangups may have been addressed by l. m. orchard, who's been hacking modules for programmatic wiki control using XML-RPC. Orchard has code that works with three popular wiki packages: Twiki, UseModWiki, and MoinMoin.
Putting it all together, automated tools can watch personal writing spaces (weblogs) and write into public writing spaces (wikis). Now we just need some smarts to know when to do so.