interesting... I was talking the other day in irc about this and the possibilities if you had say 1mill to start with how much you could make over a say the next 5 years just trading Canadian for American or vice versa as it fluctuates.
Take the Canadian dollar. we were at 0.77$ to the us dollar in 2009 and have been at 1$+ for a while. I can see the Canadian dollar hitting 1.10$ or higher in the next year, possibly the next few months. Especially if a barrel of oil goes for 100$+ again "which it will".
If you invested right and follow the trends I'm sure you can do well.
I'm going to give Forex a try some day.