Ok, while this isn't necessarily an overland trip so much as it is an "overasphalt" trip, it nonetheless captures the scenery in which I think we all can appreciate. The majority of these pictures are taken on the Icefields Parkway:
http://traveler.nationalgeographic.com/drives/banff-jasper.html
http://www.icefieldsparkway.ca/
which travels between Banff and Jasper. I believe the total length to be somewhere in the neighborhood of 145 miles. The scenery is simply stunning. I was keeping my eyes peeled for any turn-offs that could possibly be used for overland travel during the winter months but saw nothing. The probable reasoning for this is that you are surrounded by Canadian National Park land. Not until you get north or southeast of Jasper do you run the possibility of overlanding.
I was somewhat in a hurry, think Smokey and the Bandit without Sheriff Buford T. Justice on your arse and you get the picture. I was competing with the rotational speed of the Earth, and we know how fast that is, much less driving a Rover, and making sure there was enough sunlight as I coasted into the town of Jasper.
Also, I probably wouldn't advise driving at high speeds and operating a camera at the same time. However, it turned out as good as buttah allowing for a few stops to get out and soak in the fresh Canadian air.
Enjoy.
My pics:
http://picasaweb.google.com/dgride/TripToCalgaryBanffAndJasperThroughBanffAndJasperNationalParks#
Other interesting facts and information about the Columbia Icefields:
An interesting fact about the Columbia Icefields is that it is one of the largest accumulations of ice and snow south of the Arctic Circle. It covers an area of nearly 325 square kilometres (125/Sq miles) with depths reaching upwards of 300-360 metres (950 - 1200 feet).
http://www.explorerockies.com/columbia-icefield/
http://en.wikipedia.org/wiki/Columbia_Icefield