Game Access, A Canadian Gamefly
I've always been on the lookout for a decent Canadian online game rental site that actually did games exclusively and had decent stock. These guys dropped me some PR so I figured I'd give their free trial a try. I signed up early in the day, picked three games (Dead or Alive 4, Kong and Gun for the 360) and Kong and Gun were sent out a few hours later. Obviously it's Christmas so we'll see how long it takes to get here and what the turn-around time is on sending games back and getting new ones.
Their selection is solid and most of the games I could think of were there. They are based on Montreal and they use Canada Post. I'll update this thread after I have some more experience with them.