In the past couple of years, the following countries have stopped using the dollar as their reserve currency or have dropped their currency's peg against the dollar:
Norway and some other Scandinavian countries
The following countries are rumored to be considering dropping the dollar as their reserve currency or terminating their currency's peg against the dollar:
The Arab Gulf States
As Assistant Secretary of the Treasury, and the "Father of Reagonomics", recently said: "The dollar's reserve currency role is drawing to an end".