SuperSync
SuperSync is the best way to visually compare and merge multiple iTunes libraries. All your music, movies, and playlists can be synced across all the computers you keep music on.
Martian SlingShot
SlingShot 2.0 adds support for synchronizing Playlists of music from iTunes. It works just like you might think: you Publish a ...
NetSync for iTunes 2
Manages your Itunes library like the mediarover.
CopyTrans TuneSwift
CopyTrans TuneSwift automatically backs up and transfers your iTunes library from one PC to another drive, another PC, or Mac. ...