Commuting in Ottawa
By carpooling you can share a ride to work, with all riders chipping in to cover the expenses, and one can just as easily share a ride to the grocery store or a trip to another city. Benefits include qualifying for a better parking spot.
This Sample Ridesharing Agreement from The Sharing Solution covers details you might not have thought of, including a guarantee of sufficient liability insurance.
Inter-City Ride Share
Kijiji Ottawa has this ride share section allowing you to offer or request rides between Ottawa and Toronto, Montreal, &c.
For car sharing resources go here.