I'm trying to get Mac OS X to run on my Samsung R590 and I'm not having much luck... I can installed 10.6.3 from my retail disk, using iBoot, and it's usable - though the ethernet or wireless LAN adapters don't work, and I have to reboot with iBoot every time.

Although I have no clue what I'm doing, I read that I may need a "DSDT" file - and I couldn't find one for my laptop - so I set about extracting it and fixing it (well, trying to anyway - I did seem to get rid of the errors and warnings). I tried using it with MultiBeast but it didn't help or fix anything, but maybe it's of some use to someone else: SamsungR590.zip.

UPDATE: It seems things work fairly well (after updating to 10.6.6) with my DSDT file and the MultiBeast (3.20) settings below:

(The "System Definitions" is set to "Mac Pro" otherwise the nVidia drivers wont install)

Chameleon boots (so you don't need the "iBoot" disk) and the keyboard and trackpad works (though the trackpad's detected as a mouse, not a trackpad, so swiping doesn't work). LAN and Wireless still don't work, despite having tried multiple kext files and adding a "IONameMatch" to "AppleAirPortBrcm4311.kext/Contents/Info.plist" (see http://www.insanelymac.com/forum/index.php?showtopic=223182 for more info - my R590 has a "pci14e4,4727" wireless adapter).

You can get sound working by using "VoodooHDA" (here's the exact version I used: VoodooHDA.kext.zip) - I had to "sudo rm -rf /System/Library/Extensions/AppleHDA.kext" though - and "VoodooBattery" (version I used: VoodooBattery.kext.zip) will show your battery status etc.

Update: It might also be worth keeping an eye on http://wiki.osx86project.org/wiki/index.php/HCL_10.6.6/Portables#R590 - in case anyone else adds to it :/