I've been using (and discovering) Toodledo for iPad since a week. For now it supplies in most of the things I've been looking for in a TODO app. So far I've got one question: what's the reason subtasks are only part of the PRO version ? I would think the upgrade to PRO would be sufficiently covered by all the other stuff, not just the functionality of sub-tasks.
Another remark would be a feature request: is it possible to supply the notes screen with a small button to add the current date/time. I'm using the note as a kind of small log of things happening on a task and hate it to continually enter the date/time.