AmigoExpress is a rideshare web site in Canada, but it's in French! I think it's focused on Quebec and other French speaking parts of Canada.
Really interesting article about folks who built a cabin (they don't actually live there) for $7k of materials on an island near Vancouver.
A pretty basic rideshare listing page.
BUNAC handle all the Canadian working holiday visas and also offer programmes in a range of other countries including the US.
Canadian Immigration web site.
Carpooling / rideshare site for Montreal. There are some long distance rideshares available.
HitTheRoad.ca is a rideshare web site that focuses on rides between Toronto and Montreal (and back) in rental cars. It currently costs $35 each way.
Interac offers an email money transfer service between people with Canadian bank accounts.
MoreMontreal provides a rideshare service where you can post and search for rideshares to and from Montreal.