Three major collections for Canadian research are presented at the Canadiana site. They are "Early Canadiana Online," "Heritage," and "Canadiana Online." Links to the three are prominently displayed across the top of the landing page. Among the three collections there are millions of scanned pages of periodicals, newspapers, government documents, and more.
The "Heritage" collection specifically links to some of the key collections from the Library and Archives Canada.
Check it out at: http://www.canadiana.ca/