It's a modern-day urban legend whose authenticity has yet to be verified:
A guy is getting ready for a road trip with his buddies to Las Vegas and they decided they wanted some tunes (Tom Jones fans?) to set the mood. He busts out his iPod, already all loaded up with the essentials like Frank and Sammy, and asks if he can plug it into his friend's computer's USB port to charge. When he does, all of his precious collection of songs are gone in a flash forever as the computer's iTunes was set to automatically sync up to any iPod attached to it.
Well, here's to hoping that will never happen to anyone after March, as the Tune Blocker will be on the market. It's a USB cord for iPods that has the option to switch between full function mode and charge-only...
The Tune Blocker, introduced yesterday at Macworld, is a USB cable that switches between regular USB connection and a power-only, non-iTunes-launching mode.
It comes in two different cord lengths, 3 foot and 6 foot for $24.95 and $29.95 respectively, and is compatible with all docking iPods.