http://refit.sourceforge.net/
You'll want to use the rEFIt boot manager. It makes things easier, even thought it's possible to just use the standard firmware loader to boot other operating systems. I have not tried the latter. If you do want to use the firmware loader, then you'll want to use eLilo or GRUB 2 (unstable) as your bootloader because they support booting on EFI. Installation and compatibility will vary based on distribution. I'm not sure if you can even run OpenBSD on current Macs; I'm not sure of hardware support. I know that FreeBSD is still flaky on Macs.
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"UNIX is basically a simple operating system, but you have to be a genius to understand the simplicity."
MacBook Pro (Darwin 9), iMac (Darwin 9), iPod Touch (Darwin 9), Dell Optiplex GX620 (FreeBSD 7.1-STABLE)
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