But maybe all that is needed is already included (see also /Library/Printers/Canon/BJPrinter/Utilities/) and all that's to be done is go to System Preferences, Print & Fax to add a new printer. Given the notes I wrote down about the cd not being usable, I might have downloaded some new software then.
And maybe this is also required for normal use, like to see the supply levels - but I don't see those on demand anyway, though the printer does warn me when ink or paper runs out.) (At least during installation: if not allowed, then the list for 'Canon IJ Network' in the Network Setup program will be empty. The firewall must be set to allow incoming connections for 'Canon IJ Printer Utility'.(My printer cd is labeled PIXMA iP4000R Setup Software & User's Guide, MCD 1.1, QH7-1581, copyright 2004.) The Network Setup program on the Canon printer cd does not work with Leopard.The Canon PIXMA iP4000R drivers are included in a default installation of Mac OS X Leopard.Especially for those installing a wireless printer but facing an empty list for 'Canon IJ Network', here's what I've written down after installation of a PIXMA iP4000R on 10.5 Leopard, a long time ago: Not 10.6 specific, but just for the archives.