I'll second using Kijiji and UsedOttawa especially for picking up second-hand Wii games, kids toys etc.
I'm signed up for two local FreeCycle Groups. I have never picked up stuff from others but I have used it to rid my house a couple of times of stuff that is wasting space but I simply can't put on the curb (like old speakers).There is a Freecycle group in most areas of Canada. Just look them up on yahoo groups. They are a great way to both get rid of stuff just hanging around and get the stuff you need!