QUOTE
According to people familiar with the matter, engineers for the company recently determined that Leopard installs on 800MHz PowerPC G4 systems ran "too slow." Support for those systems was subsequently pulled from the most recent pre-release copies of Leopard, which inform testers that the software "cannot be installed" on those computers.
Instead, Leopard will now require Macs with "an Intel processor or a PowerPC G4 (867 MHz or faster) or G5 processor." Other system requirements include a DVD drive, built-in FireWire, at least 512MB of RAM (additional recommended), and at least 9GB of hard disk space.
http://www.appleinsider.com/articles/07/09...hz_systems.html
Sounds a mite on the overweight side! I guess they have to have some reason to buy newer machines!
That XPostFacto page looks like it's pretty old; I'd be surprised if it was ready for 10.5! I'm not going to worry about it; 10.4 is working great at home and at work and most of the lab G5's at work are still running 10.3!
You're not upgrading?
Why not? 