iPod iPhone iPad Extension Cable (BLACK) 36" Extender 30-Pin Male to Female Dock Connector AUDIO, VIDEO, & CHARGE TRANSFER
This worked erratically and was kind of flimsy.  It broke fairly quickly.  It was also very cheap so I got what I paid for.  Worked fine (when it worked) with iPod classic, the old \\"long\\" nano, but not with the new, small nano.  That's probably an apple thing and not the fault of the item.