I see the list of "Recently" Completed Tasks, but is there a control on what the definition of "Recently" is? I'd like to produce weekly, monthly, quarterly, and (perhaps) yearly reports on tasks that I've finished. Is there such a control?
You can't change the scope of the Recently Completed filter, but there are several ways to see all your completed tasks. See this help topic: http://www.toodledo.com/info/help.php?sel=86
You can also export all your completed tasks as a CSV file.