Apple iPod
Apple's iPod has been hugely popular
As a sign of the global reach of the iPod, an Australian bank has opted to use the music player as a benchmark to track currency values worldwide.

Commonwealth Securities has launched an iPod index, based on the cost of the 2 gigabyte iPod Nano player as a way of showing if a currency is overvalued.

full story: http://news.bbc.co.uk/1/hi/business/6286211.stm