I have the same printer with an iMac. You will not be able to scan on either Tiger or Leopard using Bluetooth. Only the printing function is offered over the Bluetooth connection and will work on both 10.4 and 10.5 (and isn't your fastest means of printing). With the USB cable in 10.4 you can scan and print with ease. In 10.5 everything works fine except for the scanner will not work in any application that is not TWAIN compatible. Here is the Leopard compatibility link to the manufacturers website http://www.usa.canon.com/consumer/co...&modelid=13799