We have an inventory report (via Altiris) that runs every night to show the equipment that gets moved to a location where they are no longer managed on the network, ie; surplus, offsite, etc. Since these systems no longer needed to be managed, we can remove them from our SEP console. There is a report for this on the reports tab. This schedule report shows all systems that haven't checked into the server for 2 or more weeks. This has been very helpful for us. This report can also be run for a specific time period on the Quick Reports tab as well.