I also tried to install Leopard onto my machine running an AMD 5600+ and got as far as Yams. I tried a few different install methods - native and dding a vmware image. It was pretty much futile because I was trying to install onto a SATA drive on an nForce5 motherboard. I needed patched kexts for my SATA controller and I'm pretty sure nForce5 is still unsupported.
My vmware install booted nicely though. It just runs like crap. The install time was the same for native and vmware (kept hanging because of SATA in native) when native worked.