If you install linux on a different disk, you may not need to copy the efi_v8 file to the /boot/grub.

I have a triple boot Mac OS X, Win XP, Ubuntu 8.04 and my entry for Mac OS X (with EFI/Vanilla) is

<pre>
title Mac OS X 10.5.2 Leopard
root (hd1,0)
makeactive
chainloader +1
</pre>

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Gigabyte P35C-DS3R
Intel Core2Duo Quad 6600 OC@3GHz
3GB RAM
nVidia 9800 GTX+ 1GB
2 x 1 TB Samsung F1 (SATA)