wiki.code4lib.org was just upgraded to Mediawiki 1.16 (anything newer requires a PHP upgrade first). This will allow more modern spam-fighting extensions, such as Spam:Blacklist.
Also, email address confirmation is now required before editing pages is allowed. This doesn't seem to be as effective as I had hoped though.
Things look good so far, but let me know if you notice anything that isn't working as expected.
Information Technology Consultant
Special Collections & Archives Research Center
Oregon State University Libraries