I'm Running Grub2 and Chameleon together dude !
Steps I followed :
1. Installed Windows 7 Ultimate x64
2. Installed Snow Leopard
3. Snow Leopard now auto boots and Win 7 Loader is gone so I installed Chameleon
4. Chameleon now boots both 7 and Snow Leopard but I need Ubuntu so I Installed it AND INSTALLED GRUB INTO hd6 which is ubuntu partition number INSTEAD OF hd0 which means the whole hard disk , You can find this option under "Advanced" option in the ubuntu's installation process .
5. Now Chameleon shows Linux icon and when opening it , it opens grub 2 and loads ubuntu within 10 Seconds
BTW my Triple boot isn't that rose because I recently updated to 10.6.4 and got Kernel Panic upron the finish installation restart
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Good Luck