The peso was at 10 to the U.S. dollar in July 2008. Today, the bank rate is over 15 to the dollar, which you should get pretty close to at an ATM. So that's a whopping 50% increase in pesos to the buck in just seven months.
I'm told prices in stores are going up, but the advantage is still with U.S. dollar holders.
--Lan Sluder