CanLII www.canlii.org
Provides access to case law from courts and tribunals in the federal jurisdiction and all provinces and territories with varying start dates; also allows you to do seamless, cross-jurisdictional searches.

Federal

Canada Gazette http://canadagazette.gc.ca/index-e.html
Parts I, II and III of the Canada Gazette since 1998.

Consolidated Statutes and Regulations http://laws.justice.gc.ca/en/index.html
Maintained by the Department of Justice. Includes current and repealed acts, as well as annual statutes since 2002.

Orders in Council http://www.pco-bcp.gc.ca/oic-ddc/
You can search Orders in Council from 1990 to the present; those from November 2002 are available in full-text on the site; previous ones can be ordered.

Parliament of Canada (House of Commons and Senate Debates, Bills, Status of Business etc.)
http://www.parl.gc.ca/
This site is maintained jointly by the House of Commons, Senate and Library of Parliament and includes the debates of the Senate and House of Commons, Journals, Order Papers and Notices, and Progress of Legislation.

Ontario

Ontario Bills http://www.ontla.on.ca/web/go2.jsp?Page=/bills/bills_main&menuItem=bills_header&locale=en
Links directly to the portion of the Ontario Legislative Assembly site that allows you to check the status of a bill or locate the full text. Includes bills from previous sessions, whether or not they were passed.

Ontario Gazette http://www.ontariogazette.gov.on.ca/
This site links into .pdf versions of the individual issues of the Ontario Gazette.

Ontario Legislation (e-Laws) http://www.e-laws.gov.on.ca/
Quick, easy and comprehensive access to the consolidated laws of Ontario. The goal is for this site to be updated within two business days of a change in the laws.

Ontario Legislative Assembly http://www.ontla.on.ca/
Allows you to track the progress of bills, check for proclamations, search Hansard since 1984, etc.