The good news - it's about time they implemented this. The bad news - they did it in a crappy way. It's in the Get Info -> Sorting area. And it works, list the CDs by year or just numbered 1,2,3,etc and it orders them how you want. The problem ? You have to update the value for every track. Unlike some Get Info things, like album name, where you can change all the tracks on a CD - this one you have to hit Next and the number, Next and the number, Next and the number. It's a great feature and a crappy implementation.