The deferred filter is a great resource when you want to clean up your current task list and see what's most important. You can filter out any task when you set it to any of these deferred statuses:
Delegated - A task that you have given to someone else.
Waiting - You are waiting on something external.
Hold - This task has been placed on hold indefinitely, or until you take it off hold.
Postponed - This task has been delayed.
Someday - An optional task, or something that you don't know if you want to do, but you still want to record it for the future.
Canceled - You don't want to complete this task, but you still need it recorded for some reason.
Reference - Use this for tasks that aren't really tasks, but are more of a piece of reference info.