Shoutbox

If you have the option to automaticaly download album cover arts, activate the option that does it (Edit>Preferences>Store>Automatically transfer album art [I think it's that the name, I'm using a non-english version of it, but it's the last option of the 4th tab of the last option of the second menu =P). If the album name is correct, it will download them in a very nice reslution. (I can use coverflow in fullscreen and the covers still perfect...)
Why to use ID3 tags? Aren't them just to keep the information on the file itself? If its for that, take it easy, seems like they're automatically created when you edit the file info from iTunes.