I'd like to be able to set a 'do this on x date' as well as a due by date - because otherwise I end up doing everything at the last minute and using the due date as when I do the task too.

It would be great to have some kind of calendar style view where I can see at a glance WHEN I've scheduled tasks to be done - in a drag and drop style so that I can move tasks around depending on workload and priorities.

This would also work well for due dates too.