Assessment down for review, as some people really didn't like it... Please come back November 18th, 2011 for the re-assessed assessment :) (Well I guess that didn't happen... yet...)

Did you buy something in US$ with your credit card, but your credit card only reports the total in Canadian Dollars, so you don't know what they charged you, or what their commission was?

Here is the daily US Dollar to Canadian Dollar Exchange Rates, noon-time rates. Data is from business days only. Generally, changes are minor on holidays and weekends (though it is true that the forex market is open 24/7 and rates are constantly fluctuating). 

Average Currency Exchange Rates for 2009

2008 Average Exchange Rates are available here. 

These are the Canadian Dollar to US Dollar Exchange rates (noon time), day by day for July 2009.

The source of this data is the Bank of Canada (equivalent to the US Federal Reserve Bank).

The average rate, highest rate and lowest rate for the month of July 2009 are at the bottom of the page. 

You can use these rates to compare to the rate your credit card offers or other foreign currency transactions.