If you have a laptop synced to your ipod just download it from the itunes store in the U.S. the next time you are down there and have access to the internet. The digital rights management is working off your ip address. That is the legal way to do it, as the distribution is occurring in an area where apple has the digital rights to do so.
There are technical ways to mask your ip address or to connect through a US proxy server which accomplishes the same thing but is probably violating the rights of whoever has the Canadian distribution. If you do a google search on "Hulu" or "Hulu Canada" you'll see several articles on how people have attempted to circumvent the geo restrictions.