Hmm... I never even realised The Smiths weren't on iTunes. I just assumed they must be on it, especially as I've downloaded Morrissey from there before. This would certainly explain why I wasn't able to download the artwork for The Smiths' album covers though.
Out of curiosity, does anyone know if there was some kind of convoluted reason why it's taken so long for The Smiths to get up there (such as with The Beatles)? Or are they just not seen as important enough to bother with? (Although I'm obviously somewhat biased in my opinion, I find it hard to believe the latter to be the case.)