List of drivers HERE. Tom
From Apple:
Installing printer drivers
All included printer drivers are installed by default with Mac OS X 10.5 Leopard. If you custom install, you can select which printer driver packages you would like installed. The Apple LaserWriter PPDs and sample drivers included with CUPS are installed as part of the Essential System Software package and cannot be customized or installed separately from Mac OS X.
If you would like to install any of the optional printer drivers after installing Mac OS X, insert the Install disc into your computer and use Optional Installs.