unpublished content

Hi There.

I successfully added a Rule -- ON event User has logged in, DO show a configurable message on the site.

Basically, I want to add logic to this -- show message IF there is unpublished content. I allow anonymous users to submit a specific node, and admins can choose to publish or delete the content after reviewing. I already have a notification email that goes out, this is just another feature I would like to add.