I've been using my iPod less over the last year or so, and in the time have gained more music in my iTunes library as well as doing some spring-cleaning. This means that my iPod has a very different selection of music on it, much of it from past computers that isn't in my iTunes library. Is there a program to let me compare the two? That way I could delete the unwanted songs on the iPod and keep it current, without the iTunes sync deleting songs I do want to keep. edit: It looks like Senuti does this, but I can't open the downloaded file. Double clicking on the .bz2 makes a .cpgz file, double clicking on that makes a .bz2 again. Using Unarchiver gets me a .dmg which won't mount.