Download, unzip and stick the two files (cf.icns and cf.keylayout) in /Library/Keyboard Layouts. Then go to System Prefs, International (Language and Text for Snow users), Input Menu and check off “Canadien Francais 0.9″. (You may need to log out and back in before the new layout appears in System Preferences).

I did NOT make this keyboard layout, I found it somewhere on the web but the original site is now gone.

Voici le clavier Canadien francais pour Mac OS X. C’est l’equivalent du clavier “Canadian French” ou Francais (Canada) sous Windows. Lien de telechargement ci-dessus.

You may also want to try Microsoft’s keyboard layouts bundle: Microsoft Keyboards.bundle