Peter,
We use a version of what Jon describes in his linked post above. It works great. We created a username called "FOLLOWUP". Anything deemed worthy enough to keep track of is sent to that user. We use this to track abnormals etc.
Our front office staff all have access to this username. As things are reconciled (ie results of follow up studies, consults etc), they are deleted from the inbox of the FOLLOWUP user. Anything still listed in the inbox is pending.
