Enter Matias's , which was announced at Macworld Expo and available for pre-order today (it'll be shipping in March). It offers up a way to charge your iPod on any old computer without fear. Tune Blocker is a USB to Dock connector cable that has a special switch: In one position, it'll act like any old iPod cable, syncing all your data in the most helpful way possible. But the magic happens when you flip the switch on Tune Blocker to "charge only." This disables the syncing functionality and simply charges your iPod/iPhone via USB. No syncing, no potential-iPod-erasing, and no one else's music harshing your buzz.
Tune Blocker will be available in March and it comes in two versions: one with a 3 foot cable for $24.95 and a 6 foot version for $29.95.