MyMind. Here are some screenshots.
Some good points: easy to use, almost as fast as a text file by using the key binding and an interesting feature, the map. This map allows you to make links across items, in addition to the items hierarchy.
But clearly, this application isn't designed to be a ToDo list manager, the notion of date is missing.
So to sum up, here are my needs:
Do you know the good solution for me ? stop managing my tasks ? :-)