As mentioned in an earlier post there is a useful University link for information about wireless at: http://wireless.utoronto.ca/using.
As of June 20, 2011 the wireless situation has improved. The bandwidth is better and with a modern wireless card you can use a new SSID which will not require manual reauthentication every time you connect to the wireless network.
The old SSID is UTORwin and its WEP key is UToronto1home (you should avoid using this SSID if at all possible, as it is quite insecure).
The new SSID is UofT (which uses the more secure WPA wireless protocol). You then only have to authenticate once against radius.wireless.utoronto.ca with your UTORid and password. If you have problems you can verify that your UTORid and password are valid. If your UTORid and password are valid and you are still having problems then detailed configuration instructions (for some OSes) are available.