Not strictly audio related, but following a link from my graphics hero, Edward Tufte, I landed on this:
A few months old, but still relevant, and ios audio apps still require significant thought in their GUI design.
As for Edward Tufte, everyone with a couple hundred bucks and the opportunity should take his one day seminar…Price includes copies of his books, and if you show up early, he will sign them. A serious eye opener, worth every penny. Check out his site here: