Traffic cams for Toronto, Montreal, and Ottawa ARE part of the SkylineGlobe service.

More Canadian info:
+ Compilation of Traffic Cams for 10 Areas
+ Toronto Cams and Traffic Flow Maps
+ Quebec Traffic Cams
+ Vancouver Traffic Cams
+ Alberta and Calgary (Map)
+ For Other Provinces, Look in the Right Rail for “Provincial Road Reports”

Sometimes, it’s useful to actually see where you’ll be driving. Trafficland.com aggregates traffic cameras in many U.S. cities, Canada, Denmark, New Zealand, and the UK (London*).

Btw, SkylineGlobe (a digital globe service, free) let’s you embed live traffic cams (via TrafficLand) on top of the aerial imagery for many metro areas in the U.S. and London, UK.

California offers this page with full motion traffic video and real time access to the California Highway Patrol Traffic Incident database. The page even auto-refreshes every 60 seconds.

Mobile? Well, Trafficland offers a a mobile version for the metro D.C. area (fee-based) and the City of New York offers a mobile version of their traffic cam site.

Almost forgot, MSN Auto offers real-time traffic incident maps and very localized traffic text alerts via email or SMS. Like you noted, you can also find traffic info on MS Live Search.

Finally, Traffic.com. This service is feature packed and is free. Some of what they offer includes:
+ Personalized traffic info (you create a route(s)). Info delivered online, via RSS, SMS, email.
+ Metro area RSS feeds.
+ Incident alerts via email or SMS.
+ Mobile site.
+ Phone tools. In other words, dial a phone number (1-866 MY-TRAFC) and traffic info is read to you.
+ Traffic.com also offers cameras via TrafficLand.

* You can also access live traffic cameras for London, UK here as well as this London traffic incident map.