Just saw this today on my statement, looks like it will affect those with Citi accounts that pull funds out of Banamex:
Effective January 26th, 2008 we will impose a fee equal to 2% of the transaction amount
(including credits or reversals) on all ATM and/or POS Debit Card transactions
(U.S.or foreign currency) that you conduct outside the 50 United States or Puerto Rico.
This fee will apply to transactions made at Citibank and Non-Citibank ATMs.