Use a 'USB Condom' to Protect Your Devices at Public Chargers
by David Murphy from Lifehacker on (#4W13M)

Yes, it's a terrible phrase, but a "USB Condom" is a great little gadget you can buy to prevent an unknown attacker from doing something they shouldn't when you're charging your device. In other words, a USB "data blocker," if you prefer that phrase, will allow you to use public USB ports to charge your phone without"