As already noted, Workopolis and Job Bank.
They are the best I have seen as you can narrow down the search to your specific geographic area.
With Workopolis you can create many search patterns and save for quick searches on new jobs each time you return. Storing different resumes allows a fast job application.
www.workopolis.com (external - login to view)
Job Bank (HRDC) also allows area searches, and you can select LAST 48 HRS for a quick search. Jobs are listed by date/time posted - first in list being most recent.
www.jobbank.gc.ca/Prov_en.asp (external - login to view)
I found the others to be labour intensive as you had to search your whole province and see what jobs were in your area. If you don't mind moving for a job then you would probably not mind. Most people like to stay put and not change where they live.
A few others:
www.jobs.ca/e-login.asp (external - login to view)
www.careerclick.com/generic/home.jsp (external - login to view)
www.canjobs.com (external - login to view)
CanJobs has subsites for each province like
www.ontariojobs.com (external - login to view)