I was under the impression that Flashpoint was on CBS as well at some point.

Of course there's also the old and new Degrassi which I'm pretty sure had at least mild popularity in the US if Kevin Smith was a fan.

How about Trailer Park Boys, Corner Gas and Little Mosque on the Prairie? I just pulled these out kinf of randomly as I don't watch them myself. These shows are very Canadian, as opposed to the first three I mentioned, even though Flashpoint and Rookie Blue both take place in Toronto. Combat Hospital was a summer show this past year and is supposed to be coming back to ABC. It was rather successful and replaced their failed tropical medical show.