Rain
The biggest difference I've noticed is that albums mastered for iTunes usually come with a digital booklet...
i noticed that-i guess it`s to compensate for the lack of a cover and bibliography-it`s also a nice surprise to have video occasionally included and is still way cheaper than buying through the local record store and you don`t have to leave home.

if that`s Apple philosopyhy i am okay with it as it really pisses me off when people offer me thumbdrives of music and video which is
stolen property but the average mindset just doesn`t get it- someone has to buy the music/video or it just won`t get made.
that`s the downside,apparently,artists get SFA from Apple versus cd sales so that leaves revenue from live performance which is good for music generally.
i
AM not buying an IPad though.....
cheers