YamiPod is a freeware application to efficiently manage your iPod under Mac OS X, Windows and Linux. It can be run directly from your iPod and needs no installation. Take a look at the feature list to find out what it can do and feel free to suggest anything that might be missing.
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FEATURES:
> MP3 and AAC files can be copied to/from iPod
> Built in music player
> News RSS and podcasts to iPod upload
> Growl support
> Last.fm support
> AND MUCH MORE..
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(From www.yamipod.com)