Toronto is fortunate to have a number of startup incubators. The MaRS Discovery District is the largest of them. The Research Innovation Commercialization (RIC) Centre is another.
For those starting a business or candidates applying for a job, it would be a great idea to review the Entrepreneur's Toolkit and MaRS Library.
If you're trying to keep tabs on technology innovation, CrunchBase is your one-stop shop.
Narrowing down the focus, if you are specifically interested in Hadoop and Big Data initiatives, you should subscribe to the weekly Hadoop newsletter.