The version of Mandrake 9.2 reviewed here is the Discovery Edition, which isn't available via download.
The download edition has only open-source packages in it, which, obviously, doesn't include the ATI drivers. However, if you are a Mandrake Club member, you get access to an URPMI source which has all the commercial packages that come with the full retail version of Mandrake. This allows you to replace the stock Mandrake kernel with the ATI version (version 3.2.5).
Interestingly, they also have an NVIDIA version of the kernel.
So, suffice it to say, if you want an auto-install of the ATI drivers, you will need to either:
1. Purchase Mandrake from a store, or
2. Become a Mandrake Club member, and use RPM Drake after the install to automatically get the ATI drivers installed.
I compile my own kernel, and I've already got the newer (3.2.8) drivers installed, so I didn't try any of this. I just saw that the kernel rpms were available through the Club repository.