Do you mean the coin (aka "Loonie") or the worth-more-than-the-US-currency itself?
I liked the Canadian dollar better when it cost 62 cents. Then I went to Montreal 2-3 times a year.
Thank you for visiting. The 62-cent CDN dollar kept me out of New York, though. (Maybe you should be thankful for that! )
The period I spent in Canada it went down from about $0.9 US to about $0.6 at the worst point (around the time of the Quebec referrendum) and there were very big increases in taxes. Trips to the US and UK became very expensive. Of course, it improved within years of leaving - but I guess it could reverse back when/if the commodities boom subsides.