Do you have any links with detailed instructions on how to get this up and running? I wouldn't mind having a dual boot Windows/OSX on my x201.
This one-stop manual should get you a system that boots from the hard drive:
http://tonymacx86.blogspot.com/2010/04/iboot-multibeast-install-mac-os-x-on.html
It is vital that you either install the VoodooPS2 driver using Multibeast and Kext Utility before the first reboot or have a USB mouse ready. A vanilla OS X does not know of a thing called PS/2, so you'd be stuck without a pointing device and OS X is impossible to use by keyboard shortcuts alone.
From there on it's mostly making a list of what does work and what doesn't (YMMV, some things that should never have worked at all according to the forums worked out of the box for me while others that should be a walk in the park did not work at all). Then the googling and patching starts, but apart from some things like non-atheros WiFi cards it's no worse than driver hunting for exotic hardware under Linux.
WiFi is notoriously hard to get working with non-apple cards, just order the exact model that is in the real MacBooks and you'll save yourself a huge headache. They're like $20.
Lenovo laptops only accept Lenovo Wi-Fi cards, these are $25
I'm still undecided if i pull this Hackintosh thing through or switch to Linux, will order one when decided.
Hibernate should work if you have a valid DSDT and rebooting and such work.
Rebooting does indeed work, shutting down only works sometimes - both did so out of the box which as far as i understood is not normal.
I just realized i don't have any battery controls etc either so i'll have to look into the whole ACPI business later today.
EDIT: Oh, and the stupidity of the people on OSX86 forums makes the TG section of FinalGear look like a postgrad area exam.
EDIT2: Here's a brilliant UltraNav Driver:
http://wencheng.fang.sh.cn/2010/03/thinkpad-ultranavi-on-snow-leopard.html Less-cryptic install manual: Go to Extras/Extensions or whereever you installed VoodooPS2.kext to. Right-click on VoodooPS2.kext, click on "show package contents" (or similar, i've never seen an english OS X). Go to Contents/Plugins, remove VoodooPS2Mouse.kext and copy the ThinkPadUltraNav.kext you downloaded there instead. Run Kext Utility, reboot.
EDIT3: Installing VoodooBattery.kext gave me power management. Sleep still does not work, though.