All I did to get my multi-boot working was simply install OS X [with an existing windows partiton already there], then boot with the Windows install disc and repair the boot record with command prompt [if I couldn't get right into Windows after that boot]. Then I just used EasyBCD to point it to OS X and add OS X to the boot record. On next boot, I just select the OS X line I added, and let Chameleon load and boot into OS X.

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GPU: EVGA 9800GX2 Sapphire 5870
CPU: Intel Core 2 Quad Q6600 2.4GHz @ 3.00GHz
RAM: 6GB DDR2 800 Corsair XMS2
MOBO: EVGA 780i SLI XFX 750i
OS's: Windows 7 Professional x64, Ubuntu 10.04 Lucid Lynx x64
Virtual OS's: OS X Snow Leopard 10.6.4, Android EEE PC HDD clone, Jolicloud