As an iPod user, this iPod Copier 1.0.0.5 tool could be useful for you. It lets you browse your iPod content, perfectly synchronizing the existing iTunes library content with your iPod content, even letting you make backups of that content.Thanks to this synchronization (which can also be programmed to be done automatically) you can make comparisons between existing material in your iTunes and that which is in your iPod, so it is always up to date.