First, open Apple iCal. Go to Settings, select Preferences, then select the Subscribe/Publish tab. Turn on Allow remote Subscriptions. Then choose Subscribe from the Calendar menu. Paste in the following link:
http://dcsweb.cs.toronto.edu/cgi-bin/ics.cgi/http://sites.utoronto.ca/reg/list_notices_p.pl?dept=csci&time_frame=yearYou will then be given the opportunity to give your calendar a title and to set the refresh interval (e.g. "every day").