With the current economic situation, you're starting to hear more chatter about one single North American currency. In the same way that Europe has established the Euro, some are saying that it's time North America establish the "Amero."
Here is one recent article I found that goes over a number of the related issues in detail:
http://www.howestreet.com/articles/index.php?article_id=7422
and another
http://www.worldnetdaily.com/news/article.asp?ARTICLE_ID=58877
I'm curious what people think about this possibility. Do you think it would be good or bad for Canada?