Let me start off by saying I love the site and use it with To Do on iPhone. Very few complaints, but one feature request I would like is the ability to set an item to rollover if not completed. I have seen this done in other applications. It just means that if a task has not been accomplished on the day it was due, it rolls over to the current day. That way you are not plagued with a bunch of Overdue items every day.
I like to have todo items in my today list that I may get around to, but also may not. So if these items could roll over to the next day when overdue, I would not have to go to my overdue list every day and change all the dates of those items.
I looked through the forums and noticed that many people are asking for a combined overdue + today listing of item. I think a rollover feature would go a long way to fixing those issues.