You know the little Skittle-like controls on every window Mac OS X? The red, yellow and green ones? They are lined up vertically in the top left corner of iTunes 10, instead of horizontally like on all the other windows. Weird to break with such an important foundation. I wonder if it’s a sign of things to come. There are a lot of other new icons and conventions in iTunes, too. I was surprised to see that the UI of Mac OS X itself didn’t follow iTunes 9 more closely with the Snow Leopard release; maybe the next Mac OS X will follow this iTunes.