CloudSites WordPress Scanner
June 17th, 2010Update: Cloud Sites WP Scanner is now available via the plugins repository:
http://wordpress.org/extend/plugins/jw-cloud-sites-wp-scanner/
Use at your own risk. Upload, activate, and visit new menu item. Can remove all world and group permissions. Search options table for backdoors, and posts table for spam links. Also looks for *.bak.php, *.old.php, and *.cache.php files.