Uniiverse, which has employees in Toronto and Montreal, is a service that lets people share services or activities. Some of these services and activities are free, while some are fee-based. For example, you could advertise your interest in babysitting, teaching a cooking course, shovelling snow, or finding people who share an interest in stamp collecting or playing pickup hockey.
MaRS client Uniiverse, the world's marketplace for collaborative living, is highlighted in this article from Mashable.com on The Rise of the Sharing Economy