Just to clear up this issue... it IS possible to do a clean install of Snow Leopard with the up-to-date disc. I already had Leopard installed on the drive. Booted from the DVD by holding down option during startup. Got to the part where it asks you to select the drive for the installation. Before continuing on I used Disk Utility to erase the Mac HD. Then continued the installation. Took 30 minutes. Running Leopard fine right now.