I've been playing a lot of various greatest hits CD's in my Z2 recently and when I went into the library I noticed that I have 4 or 5 albums that are just titled Greatest Hits. Is there a way to edit the library titles so I know which artist is which?

yes, there is an icon on the right side that looks like a piece of paper, you need to go to the album you want to change, and when the song list appears, click on the 'previous folder' icon, THEN click the paper icon, self explainitory from there!

HTH