remove orphaned categories in wordpress with clean it up plugin

 0 empty tag(s)
 9 empty category(s)
 131 revision post(s) in the database
 2 autodraft post(s) in the database
 11 trash posts/pages in the database
 1 unapproved comment(s) in the database
 0 spam comment(s) in the database
 1 trash comment(s) in the database
 Remove all pingback in the database
 Remove all trackback in the database
 Remove all transient in the database
 Remove all rss cache in the database
 Remove all orphaned postmeta in the database
 Optimize database tables.
http://wordpress.org/plugins/clean-it-up/