I use GRUB as my bootloader. There is a boot CD called "Super GRUB" which should be able to setup GRUB on your Windows XP.

Rick

I used to use Sabayon Linux, so I decided to throw that back into my system. So now I have a tri-boot, Mac OS X Leopard, Windows Vista, and Sabayon Linux. I am using the GRUB that comes with Sabayon Linux. Works great! - Cheers! =)

I am using Vista paralelly with Mac OS X, never tried with with XP though. I had some problems with GUID partition table so I am using MBR partition table and MBR boot sector, this way chain0 method works flawlessly for me.

@Devil In Disguise you should maybe give it a try and format your hard drive (for mac os x) with mbr partition table and install mbr boot from leopard installation.

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I agree, reformat and use the mbr partition table instead.
=)

as i had xp first, am i not on the MBR partition table with MBR boot sector? i think i am as i had xp first.. pls correct me if im wrong..

Have you tried installing just Zephyroth's Leopard? on single boot

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CPU: Phenom x3 8650 @2.54 ghz
Mobo: ASUS M3N HT-Deluxe 780i SLI
3 GB 800 OCZ RAM
Lawless 10.5.4 w/ Voodoo Kernel

some questions for a start:
1. i assume is it 2 partitions on on hdd? (not two different harddisks for the two operating systems)
2. i assume you did use mbr partiton scheme?

notes
1. if osx would reside on a seperate hdd, esp. an external usb one, it would be hassle free to install and
experiment. and one can use the bios bootloader. worth a consideration if u got a chaep external disk
lying around.
2. guid would brake win xp when used on same drive and can not incorporated
in vista bootloader.
(and guid bootloader is broken on r2, has to be fixed manually)
so mbr is the way to go (beware, diskutil sometimes has guid as default)

did you read:
http://osx86leo4all.wikidot.com/how-to-s#toc5 (with the solution winlinmac mentioned)
making partition bootable: http://osx86.wikidot.com/known-issues#toc3
reinstall the efi bootloader manually, see: http://osx86leo4all.wikidot.com/how-to-s#toc5

btw: can you boot into osx if you use the dvd to boot?

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Leopard 10.6.5 | Core i3 | Gigabyte H55M-USB3 | ATI 5770 | Coolermaster Cosmos

Yes its MBR if Windows XP is already installed, but Mac OS X can by default install its own partition table if you don't change it manually in the disk utility. Mac OS X by default uses GUID.

well ive tried using boot managers like from extended fdsik to try to boot into leopard n i got "invalid operating system"

plus i tried -
& it still didnt work.. it just booted straight back into xp..

seems like leopard only seems to work well on seperate hard drives or first installs on a HD then can try to install xp..

May be you should start all over, and backup your existing data, then start from scratch and follow the procedures I gave for a dual boot configuration. Try it and let me know. =)