Umlenker or Top Pull Device.

Recently had one of these wheel into the store and thought that it was a clever idea and worthy of a mention.

A company called Speen make this device called the "Umlenker" which translated means the top pull. Nifty little doo-hicky gives you a clean and simple method of running a traditional bottom pull road derailleur with a top routed cable. Genius, which being manufactured and designed by a German company is not at all surprising.

The device is just the silver bar bolted onto the top. They make a version for Sram, Campy Etc.

 Visit them online to see their gizmo's 

http://www.speen.de