just as an aside, I was determined to put Leopard on my family's eMac, which is 800MHz. short of the, what is it, 867MHz requirement?
plus, it can't read DVDs. problem.
so, I installed a fresh copy of Leopard onto an external hard drive. I then connected my MBP to the eMac using a firewire cable. I used Carbon Copy Cloner on my MBP to clone the fresh copy of Leopard from the external drive to the eMac's internal drive. then restarted the eMac, and voila! it booted into Leopard, no problem.
simpler than those older Macs mentioned, definitely...