Ontario Immigration is a great website put together by the Province to help immigrants at all stages. They have done an excellent job in organizing and linking information from many different sources and acting as a portal for a range of core questions that immigrants have to address.
At the site, presented in (of course) both French and English) you will find information aimed to deal with issues both before (like how to apply to immigrate, which links you to the pertinent sections of the CIC web site) and after you arrive in Canada (like how to get your Social Insurance card), guides to Ontario, information on immigrant assistance programs, finding housing, health insurance, banking, jobs and more.
This is a fantastic site and a must-have bookmark for those at any point in their immigrant journey.
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