Before I ripped my collection, I thought I'd miss my CD cases and liner notes. After I ripped them, they just sat there. I boxed them up and put them in an easily accessible place in the basement.
I don't miss them. I love getting a new CD and checking out the artwork and liner notes, but after a couple times I get bored with it.
Vinyl is different though. Nothing like a huge gatefold cover and liner notes to set the mood. Somehow, CDs just don't do the same thing for me.
What I think would be the best of all worlds would be Blu-Ray music - high-res playback, and acess to the artwork, liner notes, and extra stuff on your TV. That would be cool. Maybe people would start buying music again if they did something like this.