I love TheBrain (formerly PersonalBrain) but was starting to move away from it because they didn't offer an IOS client. We were promised one over 2 years ago but hadn't seen anything concrete. Then today I receive this email from TheBrain.
The IOS version includes everything you have come to expect from TheBrain including child/parent/jump thoughts, attachments and note.
The only requirement is that you have a webbrain account (since that is used to sync the data back and forth). I just downloaded it from the Canadian itunes store and I'll review it in a week or two.
Some screenshots for you