I just became aware of Clutter this week, and already I'm in love. Although the intended purpose is to add a more familiar interface for selecting music to listen to on your computer (namely the visual metaphor of "albums" laying scattered all over your desktop), what I found most delightful about Clutter is that it automatically looks for album art (via Amazon) and you can copy that found art into iTunes. So I was up till 3 a.m. the night after installing it, grabbing cover art for all the music in my iTunes library. I was amazed that I managed to find most of it, although my practice of renaming and re-dating compilations and re-releases to reflect the original issues sometimes caused some confusion. I'm not sure I will use Clutter in its primary capacity that much (my desktop is cluttered enough, thank you), but I definitely like having the visual reminders of where my music cane from.