The real pain-in-the-butt change, however, is that the Apple made it so that you can't turn off the little "Look for this in the iTunes store" arrow that appear everywhere. Highlight a song, and those little circled arrows appear in the Name column, Artist column, Album column and Genre column. If you highlight a bunch of songs, those circled arrows are everywhere. If you accidentally click one of them. iTunes launches the store.
What if you don't want to turn every music-playing experience into a music-buying experience? Well, under iTunes 7, you could turn off those circled arrows. On the Mac, go into iTunes -> Preferences and select the General tab. There's a convenient check box called "Show links to the iTunes Store." If you don't want the circled arrows, just uncheck the box.
Guess what? Apple removed that option from iTunes 8, and hasn't reinstated it as of version 8.0.1 (the current release as of Oct. 7). Boo! (Why did Apple do this? My guess is that they really really really really want people to visit the iTunes Store.)
However, there is a way to get rid of the arrows, if you don't mind using Terminal, the command-line utility: