For over a year our CMS site was plagued by deleted content occasionally popping back up in production or links reappearing that were dead because the content behind them was no longer there. Come to find out our background cleanup job was not created in the database. Andrew Connell has a good post about the background processing job, something to check out on CMS sites....
http://andrewconnell.com/blog/archive/2005/03/18/1016.aspx