They were all on the default fedora core five install and it has been years (literally) since I have had to install custom drivers on a linux desktop. I have had to install custom nic and video drives on an HP prolient server, I have also had to install video drivers and raid drivers on a Dell Poweredge server. both sites (dell and HP) contained the drivers which I downloaded, put on a floppy and installed..
The better question might be just how many linux workstations / servers / desktops have you set up in the past three years?