Ecuador still uses the US dollar; no mas Sucres(?).
They do so at their peril. Traditionally, countries with a history of currency debasement would peg to the dollar. But, as Argentina learned the hard way, when the dollar soared in the late nineties due to Greenspan's inflation-caused stock bubble, Argentinian raw materials became uncompetitive and the economy tanked.
At the moment, Ecuador (which also depends on exports of raw materials) is probably doing alright because a dropping dollar is making its products attractive. But a Republican presidential victory coupled with a Euro collapse could drive the dollar high enough to make them regret their decision.
These small countries should forget the politically-driven American dollar and go on a gold standard.