Hey, thanks for putting that link in. I tried following that guide you sent me, and being a newbie I got stuck. Fast. So here's what I did.
I tried doing the "FreeBSD-only Installation with ZFS" as posted in the link you sent me. Here's the catch. I downloaded the "8.0 LiveFS memstick" (which I think is this file: "FreeBSD-8.2-RELEASE-amd64-memstick.img") then I copied it into my USB flash drive (literally copied and pasted), and tried booting up my Mac with it in the flash drive. Long story short: it didn't work. Instead it booted up like it normally does, meaning it tried to boot up a non-working operating system: my Gentoo install, which doesn't boot because my custom built kernel is crap (I'm a newbie remember?).
Anyway, I'd still like to get FreeBSD on my Mac. But I'm gonna need a bit of help...