Drag artwork from the artwork viewer to your desktop. Used to be .pictclipping, now it’s whatever the original artwork was (jpg, png, …maybe even bmps or tiffs).
When the artwork switches in the artwork viewer it’s all Core Animationy or something. There’s a fading transition.
The artwork view switches from Now Playing to Selected Item when something other than what’s playing is selected.
Grid view scrolls like butter. 3803 albums in my library and it feels like iPhoto now.
In Coverflow, albums without artwork used to be black. Now they’re blue.
First iPad sync made me think something was very very wrong. Took forever, got beach balls.