I haven't tested or significantly examined this yet, but adventurous souls may wish to try out the 'Bad Behavior' spambot detection & blocking plugin for WordPress and MediaWiki:
http://www.ioerror.us/software/bad-behavior/ http://www.ioerror.us/software/bad-behavior/installing-and-using-bad-behavio...
-- brion vibber (brion @ pobox.com)
wikitech-l@lists.wikimedia.org