I'm having a little trouble. I recently received an iMac PowerPC G5 with a busted HDD.
It has that infamous problem with the SuperDrive spitting every disk out, so I used dd on my linux box to put the Tiger image onto a 4gb pen-drive and booted it up through open-firmware via "boot ud:,\\:tbxi." I'm now successfully running Tiger.
However, support for Tiger is pretty poor and this guy meets the prereqs to run Leopard. Problem is, I don't have an 8gb pen-drive to hold that massive dual-layer image.
My setup is simple-- I have a Linux/PC dual-boot box and an iMac hooked together through a wired router. I don't care about security issues, I just need the simplest possible way to boot this thing over the network. I have the Leopard install image as a .dmg, but I can make it whatever format is best.