Actually, the value of the dollar is mainly dependent on largely emotional investment runs in the short run and confidence in national fiscal policy in the long run. The Canadian federal government can be given a great deal of credit for the latter. Keeping the value of the dollar low is certainly not "silly", it has allowed us to keep an edge on our only real trading partner of consequence, it has been a large part of what has lured a great deal of the manufacturing allotted to north America as a whole. There is also the natural bias of the American markets for internal consumption and the border costs which are eliminated by maintaining the dollar at a reduced level. Short of tearing up NAFTA and having a major economic realignment this is the best policy and has proven to be such as it has resulted in the strongest economy in world.
Secondly only to a Saudi Arabia which is looking increasingly dishonest in there evaluations of there own reserves.
Hardly, the liberals are the single biggest reason for Canada's economic resurgence, while the Americans moronic fiscal policy and the rising commodity markets are major factors, even combined they don't make up for the investor confidence that has been created in the Canadian market.
The US dollars value is 50% of the relative fluctuation, this is a mathematical reality. As to the American dollar, its value is being carried by the pegged Chinese currency and has maintained its strength despite the US's best efforts to devalue it. This has resulted in an extremely volatile currency market. It’s a circumstance Canada should be taking advantage of by matching the US increases in currency production. But that is the only complaint I can really think of over the last several years of this government’s fiscal policy which has on the whole been brilliant.
I am not quite sure what you are suggesting they could have done here? We have maintained a relatively stable economy through this boom and have actually had a much smaller boom then the US, the reality is that we followed suit so that we wouldn't be hurt by to large an outflow of investment capital. This wasn't really in our power to control as we were just maintaining our advantage on the US, again they did the right thing, in fact the only thing they really could of.
I do agree however that the housing bubble will pop and personal bankruptcies will skyrocket much as they did in the 80's but I would bet money that they won't be even close to what we will see from our neighbors to the south. This is one of the unfortunate realities of having free trade with a market 10x your size right next door.