It would be great to have a calendar view of the current week (or day, or month) next to the checklist (where the keyboard hints are currently displayed) and being able to drag and drop tasks into the calendar.
This calendar view would be awesome to schedule your day and week based on your priority, and have a quick view on what needs to be done today.
If you couple that with Google Calendar integration and a full iphone app, you've got yourself the dreamiest organizational tool of all times!