You have to configure EasyBCD to tell it that you have a Mac OS installed. I managed at least that much. When you reboot, it will show all three. I have XP Pro x32 on partition1 of drive0, Vista Ultimate x64 on partition2 of drive 0, and Mac OS X Leopard on partition1 of drive1. It sees all three, but I get the boot chain error when I try booting to Leopard.

Configuring EasyBCD was pretty easy, I'm sure you'll figure it out. Can't be of much more help, as the machine that all that is set up on, is currently booting from DVD to reinstall OS X.