I've been wondering why Apple uses a different interface elements for iTunes, when they could certainly just use the regular OS elements. I first noticed this when using the trial version of ShapeShifter. It wouldn't change the iTunes interface. Today I noticed that the edge smoothing on the iTunes windows is non-existent. The top window is Finder, the middle is iTunes, and the lowest is Safari. If you look closely you can see that Finder and Safari have anti-aliased corners while iTunes has a straight pixelated bitmap like corner. I never noticed it before, but now that I do it's actually rather jarring. Like that squeaky mattress spring that you don't notice until someone points it out and then it keeps you from falling asleep. Why can't Apple just use their standard interface elements?