Google Webmaster Tools alerted me to the situation with an email. They have since confirmed that all the malware has been removed.
This involved upgrading WordPress to 3.0 as well as going through every post to remove the payload and fix the title. I took the opportunity to purge many of the posts.
WordPress 3.x seems much nicer than my creaky old install of WordPress 2.x. The widgets are very handy, as is the integrated update functionality for both WordPress and WordPress plugins.