That's very exciting.
I would like to see a universal playlist management software. You would just drop a playlist from your desktop application into a folder (via sync, thumb drive, mail attachment, whatever) and this application would read it in the background, completely transparent to the user, and would make all the necessary corrections to it, if needed (wrong folder, missing songs, etc). It wouldn't matter what format you'd drop in. CSV text files, WPL from Windows Media Player, m3u, or iTunes. It wouldn't matter if you have 500GB worth of songs in the desktop, and only 10Gb in the car. The missing songs would not even appear to the user, and no error message would be displayed ever (but on the log file). Smart playlists would be simply converted. More importantly, all the rating info would be preserved, if the file format so allowed (and the client app).