SLE - That's a great link...you beat me to the punch!
Just be advised that the list on that website is NOT 100% CURRENT.
Some countries are on there that are listed as having limited practice rights, which may NOT be true as of 2002.
Also, realize that some of the countries listed there have not been petitioned recently so they, too, may have updated their policy on United States trained DOs practicing.
Overall point - more and more countries are allowing US trained DOs.
Best of luck.