Ridejoy looks great, but Canadians out there should really take a look at LiveRides (http://liverides.com)

Their app does what Ridejoy does and more - it even lets you securely communicate and track where a driver is when he/she is on his/her way to pick you up.

I'm really glad to see people in this space. I'm fed up of big oil and driving my car alone. Driving should be a social experience with friendly people that doesn't hurt the planet needlessly.