I would never backorder any domain at Godaddy because they will send the domain to auction even if you are the only person to backorder.
I know two websites that provide .CA backorder. One is pool.com, as you have already mentioned, the other is sibername.com.
As for monitoring .ca domains, I provide this service for free on my website and I don't know any other website that does. As soon as the domain is published on the TBR (to be released) list you will get a free email notification along with the last backorder date and a link to backorder.
Happy domaining
Erdinc