Well, at least, it was a minimal quake, though I would imagine that there aren't that many in Ontario although that's not surprising since the New Huntingdon fault is one of the biggest in North America.
I was in the Orleans area (near 10th Line at 174) and felt the building start shaking, like a train was going by real close. It couldn't have lasted more than 10-15 seconds. At the time, my friend said there was a big salt truck making a U-turn in the parking lot outside, so we figured that was what caused it, but I was thinking, "man, that's a big salt truck to do that..."
The Ottawa Citizen says that we can expect more (although smaller) tremors over the next few days.
This was the first one that I have felt in Ottawa (in the 8 years that I have been here). I slept through the last one that happened about 2 years ago.