The Easy iPod Media Sharer.

This device allows you to easily share music, video, and pictures between two connected iPods without the use of a computer. It automatically recognizes when you plug in iPods (either Mac or PC formatting) on either end, and it can transfer a three-minute song in five seconds and a 30-minute video in three minutes. The device can also transfer any files when the iPods are set to "disk drive" mode. Its rechargeable battery provides up to 1 1/2 hours of operation during transfers, and includes an AC adapter that recharges the device in four hours; iPods are recharged while connected. Not compatible with iPhone or iPod Touch. 3/4" H x 2 1/4" W x 3 1/2" D. (2 oz.)

View complete listing of compatible ipods.