Hey there,
As long as you are in process for PR, you are an American Citizen. When you have your PR, and live in Canada, you will be a Canadian Resident. When you work in Canada, you pay taxes in Canada, and only US taxes over the time of the emigrationyear you spent in the US. You stay a US Citizen, untill you've taken the Canadian Citizenship test, which is NOT necessary. You can stay a Canadian PR for the rest of your live. You can only not vote. But you could still vote for US...
Here are the processing times from last year, which is no guarantee it will be the same this year (Berlin had 80 % in 15 months in 2005, now it's 22 months, and I don't think we belong to that 80 %, since we are in process for 601 days today, that is 20 months, and we have not done our medicals yet...)
http://www.cic.gc.ca/english/department ... d-fed.html
You should get yourself a Canadian car. I cannot ship a car younger than 15 years to Canada. (no idea why though

) I have no idea if that one is for US-citizens too. It should be registered, and inspected. But any car crossing a province - border in Canada must be inspected. If you move from Ontario to Manitoba, your car must be inspected too.
Good luck on your application!
