TuneRanger
TuneRanger makes it easy to synchronize two or more iTunes music and video libraries over a network. It supports iTunes libraries on Mac OS X and Windows letting you sync any combination of Mac and PC.
TuneRanger can also merge, copy, backup, and sync iPods via USB or Firewire. It also includes powerful tools to optimize your iTunes library, remove orphans, manage duplicates, and restore or remove disconnected files.
Synchronize what you want, where you want.
TuneRanger lets you sync only music of a certain genre, artist or type while ignoring others. This is invaluable when synchronizing small devices with large media collections. Conversely you can sync all except for certain genres, artists or types. These settings give you extreme flexibility and let you optimize iTunes libraries for individual family members with different music tastes and storage capacities.
Don’t buy music twice by mistake.
Buy music at home, the office, or on the road and then use TuneRanger to transfer your purchases safely between all your Apple-authorized Macs and PCs. By keeping all music collections synchronized, TuneRanger helps prevent against different family members inadvertently buying the same song twice.
TuneRanger is an invaluable addition to any music collection.




1 Opinions:
This is absolutely the iTunes catalog app I've been searching for! Many other "applets" exist to do one or two common tasks, but nothing has been the swiss-army knife that Just Works. In the first two days of using the fully-functional trial of TuneRanger, I was able to copy my huge WinXP iTunes library over to my Mac via LAN (thanks to a separate PC version) and subsequently clean up all orphans, duplicates, and merge the artwork database into each MP3.
Absolutely, totally, sold. Watching 5000 tracks, videos, and podcasts magically appear with ALL metadata intact without so much as a hiccup or double-click was magical. This is shareware at its finest.