It's a very cool app... and there doesn't seem to be anything else out there like it for the desktop (e.g., why doesn't Google Desktop allow you to make tag clouds?). Still, you can only view the tag cloud inside of the app and not on the desktop (e.g., in a floating sidebar) - that would be very cool. Also, adding/editing tags for lots of files at a time is pretty painful since you can't seem to edit multiple files at a time.