The Canadian postal rate in the year 2010 is, 57 cents for a one
ounce letter going to an address within Canada, or $1 for a one
ounce letter going to the US.
This depends on the value of the stamp.
Domestic postage for a standard letter is now .57 each, .60 with tax.
These stamps do not have the rate on them, and never expire. This change was done as of Jan 11, 2010. See Canada Post's website for further details.