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A lightweight iTunes-class sync service is what we need for all iDevices. Unluckily Apple doesn't believe this.

This tool proves to be worth it if cleverly developed.
 
Does work great to drag and drop music files onto your phone/ iPod. However when I had PwnTunes on my jailbroken 3GS it would randomly say "updating library" and when it was finished all the music and podcasts on my phone were gone. Just my experience with this program. Maybe others had better experience.
 
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