Great Library – Legal Periodicals Online
http://rc.lsuc.on.ca/library/research_periodicals.htm
The Great Library of the Law Society of Upper Canada maintains an extensive list of online legal periodicals.

Findlaw http://stu.findlaw.com/journals/
Lists and provides links to the homepages of a wide range of law journals, with particular emphasis on the United States.

See also the websites of individual Law Schools.