One of the first things I set about finding when I switched over to the iPhone was an outliner. As a developer-slash-designer-slash-consultant-slash-CTO I spend a lot of time making outlines of notes and tasks for things I’m working on. If it’s a “to do” I use a to-do manager, but if it’s something that’ll take weeks or months, I have to capture all of the steps and know where I am.
I settled on Carbonfin Outliner as it did everything I wanted and nothing I didn’t.
For starters, the outliner works great. It has all the standard means of moving things around. Items can be just an outline bullet or have a check-box on them, to mark off tasks as they get completed. Even cooler on the check-boxes is that the parent item turns into a disc which gets more complete as you check things off. I’ve seen outliners that have the checkboxes, but you always have to expand a parent task to see how far along you are.