Additional info:
Posted by Toodledo, November 19, 2008
We do not currently support manual resorting, but you can choose to sort your tasks by any of the fields that you are using (priority, due-date, tag, etc). Just click on the "sort" link.
Hope that helps.
http://www.toodledo.com/forums/2/909/-4220/re-order-tasks-within-a-folder.html