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• The Canon PIXMA iP4000R drivers are included in a default installation of Mac OS X Leopard.
• The Network Setup program on the Canon printer cd does not work with Leopard. (My printer cd is labeled PIXMA iP4000R Setup Software & User's Guide, MCD 1.1, QH7-1581, copyright 2004.)
• The firewall must be set to allow incoming connections for "Canon IJ Printer Utility". (At least during installation: if not allowed, then the list for "Canon IJ Network" in the Network Setup program will be empty. 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.)
• Given the notes I wrote down about the cd not being usable, I might have downloaded some new software then. But maybe all that is needed is already included and all that's to be done is go to System Preferences, Print & Fax to add a new printer. Here, go to More Printers, wait until "Searching for installed printer drivers" completes and select Canon IJ Network, which should then detect your printer. (Can anyone confirm that no cd, nor downloads, nor setup program are required for Mac OS X Leopard?)

For OS X 10.6 Snow Leopard things are a bit different. An early installation (while new drivers were not yet available) simply removed the existing iP4000R printer. When connecting it through USB it showed and installed without any question, but no luck for the network settings. On September 1st 2009 Canon released new CUPS drivers. On September 3rd Mac OS X Software Update did not know about this (yet?), and neither did the European website. However, Canon's USA and New Zealand sites list 10.6 drivers for the iP4000R. Other printers may have been updated as well. (But: meanwhile Apple Software Update might know all drivers too.)

• The Canon PIXMA iP4000R drivers are included in a default installation of Mac OS X Leopard.
• The Network Setup program on the Canon printer cd does not work with Leopard. (My printer cd is labeled PIXMA iP4000R Setup Software & User's Guide, MCD 1.1, QH7-1581, copyright 2004.)
• The firewall must be set to allow incoming connections for "Canon IJ Printer Utility". (At least during installation: if not allowed, then the list for "Canon IJ Network" in the Network Setup program will be empty. 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.)
• Given the notes I wrote down about the cd not being usable, I might have downloaded some new software then. But maybe all that is needed is already included and all that's to be done is go to System Preferences, Print & Fax to add a new printer. Here, go to More Printers, wait until "Searching for installed printer drivers" completes and select Canon IJ Network, which should then detect your printer. (Can anyone confirm that no cd, nor downloads, nor setup program are required for Mac OS X Leopard?)

For OS X 10.6 Snow Leopard things are a bit different. An early installation (while new drivers were not yet available) simply removed the existing iP4000R printer. When connecting it through USB it showed and installed without any question, but no luck for the network settings. On September 1st 2009 Canon released new CUPS drivers. On September 3rd Mac OS X Software Update did not know about this (yet?), and neither did the European website. However, Canon's USA and New Zealand sites list 10.6 drivers for the iP4000R. Other printers may have been updated as well. (But: meanwhile Apple Software Update might know all drivers too.)

For OS X 10.9 Mavericks, Jens commented:

Canon recently released a new version of their IJ Network Tool (v. 4.4.1). Using this I was able to setup the network interfaces of my old ip4000r on OS X 10.9.5 without much problem. Link to EU support site.

(I no longer own this printer; feel free to edit in other resources.)

More info may be found at macosxhints.com, 10.6: Install Canon printer drivers in Snow Leopard.

More info may be found at macosxhints.com, 10.6: Install Canon printer drivers in Snow Leopard.

For a clean installation of OS X 10.7 Lion, using a printer that had already been configured: System Preferences, Print & Scan, click "+" for Add Printer, wait until the printer appears (exactly the same screen as in 10.6), select and accept the defaults (like Print Using: Canon iP4000R), button Add. This downloads additional printer software, which when clicking the Options button shows as Driver Version 10.51.2.0. I did not download anything myself, but had no firewall running (yet). Printing the test page was very quick (in a first try I thought nothing happened, so I clicked again, to find two copies).