I was reading up on the new iTunes 4.7 (http://www.apple.com/itunes/hottips/) and some of the features are pretty cool, like smart playlists. But the advertise a feature called joining tracks, does that only work when you're importing a new CD, or can i join already imported tracks. If so how do i do that, because mine's greyed out when i select the tracks. Also what does Consolidate library apply to? if anyone knows.