Here are a few example search strings:
Find all records that are available for destruction.
dispositionActionName:destroy and dispositionActionAsOf:[MIN TO NOW]
Find all records due for cutoff before January 1, 2011.
dispositionActionName:cutoff and dispositionActionAsOf:[MIN TO "2011-01-01"]
Find all records that are due for transfer.
dispositionActionName:transfer and dispositionActionAsOf:[MIN TO NOW]