I've been wanting to make my system a tri-boot for a little bit now.
I have a generic PC, custom built, not a mac. Here are the specs:

Core 2 Duo E8400 3.0 GHz
2 GB Corsair XMS3 DDR3-1333
Asus P5K3 Deluxe WiFi AP Edition
Hauppage WinTV-HVR 1800*
Seagate Barracuda 7200.11 750 GB HDD
Antec NeoPower 650W PSU
MSI GeForce 9600GT
DVD+-RW dl Drive
DVD-ROM Drive
FDD Drive

*dont need to be able to use on Mac or Linux

I already have Vista SP1 Installed, and the HDD in 1 partition for the whole drive.

you may have to resize your partition so it can handle the other two OS's. Ubuntu will ask you when you start the install rom disc. Maybe while you're there you can create another partition for OS X for later. Ubuntu install is pretty straight forward but it will take over the MBR.

I nerver tried Leopard, but i'm curious to try it. I don't know if it's a valid alternative.
I use Kubuntu.

I have just installed Leopard and Linux on VMWARE. Why not try that ?

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