Surely, I think a very important fact that you're overlooking that IJ Reilly was trying to make is that the changes in the US dollar don't make Apple's goods cost more or less for anyone in Canada, the UK, Australia, etc.
You're paying the same as you were yesterday, the week before and the month before.
Just because your currency is worth more against the dollar than it was a month ago, it doesn't mean it's worth more than a unit of Canadian currency was worth in Canada a month ago. By your logic, the Canadian dollar suddenly has greater buying power, so why not complain about the price of *everything*? If you think a MacPro should cost less today than it did in October, then why not milk or sneakers or newspapers?
Yes, you're right that prices will trend lower with newly released products (as you pointed out with Leopard), but it's far from automatic and not as simple as Apple sitting on sidelines with its finger on a switch waiting to lower prices after the holidays so it can milk its Canadian customers for all it can...