From Christian Dunn:
It is not uncommon that printer problems can require System Administrators to manually clear jammed jobs from print queues. Print Terminator makes this easy by allowing you to select any printers on a system and in one click terminate all print jobs. You can also specify an aged time to only terminate jobs that are older than a specified number of minutes ensuring new print jobs are not affected. Print Terminator can be scheduled using the Windows Task Scheduler and can send an email notification when jobs are purged from any printer. In the free edition jobs can only be purged manually.