1. I would say, the risk free rate dropped while credit spread increases. Net effect? It depends on the banks balance sheet.
2. Canadian ecomony -> Oil price -> US/global demand -> US/global economy. As far as I know, the US fundamental indicators are going to be worse in Q2 2009, so.......make your own judgement call on the Canadain economy. But, housing market is so-called "market" because human factor plays important roles here. You might have known that from the current stock market.
3. Ottawa housing market is less elastic due to government works, etc..., but it still has slope, it was and is heading downward, though I have to admit that the good weather of spring is having a positive impact on home buyer's moods. But people need time to calm down, again, refer to the recent stock market.
4. My thoughts: houses are unique, you won't find two identical ones. If you like a house and it is within your budget, just buy it with no hesitation. This is exactly the same spirit when you chased a girl who eventually became your wife. In case you have a wife/hus and both of you like the house, just buy it for whatever it takes. My experience is: for more than a year, I have never seen a house that both my wife and I like. Location, floor plan, neighborhood, transportation, builder reputation... there is always something .... Money is a factor as well, but it becomes less important once I am tired of searching.
5. Do not be over serious. You plan to live long term in Ottawa, then buy a house. You might pay 20k or 30k more than the real value of that house (nobody knows how much it is), but after amortizing that amount by 20 or 30 years, it is not that big at all. If you are not sure about the future, just rent an apartment and never say "if I had bought that house......".
6. Do not blame my English. I do not have Windows in Chinese version here.