King Dollar still reigns. It will be awhile before it is dethroned. Nice graphic showing the "lead" it has on the next most desirable currency...

The US dollar is the preferred "medium of exchange" in conducting physical and financial transactions internationally.  It lost some of its shine during the recession (the Euro was the default currency, and the Pound and Swiss Franc to a lesser extent--you can tell by the height of the red bar relative to the blue one).

The dollar is used in approx. 44% of international transactions. This helps maintain the value and importance of the dollar around the globe.  Long live The King...

Source: NPR