ikiwiki could support grabbing the /topic from an IRC channel and putting the result in a page. See http://wiki.debian.org/TopicDebianDevel for an example. Like aggregate, the page and its updates should not go in version control. --JoshTriplett

A simple script should be able to poll for the irc topic and update a page, then run ikiwiki -refresh to update the wiki. No need to put that in ikiwiki or a plugin, though. --Joey