Short answer: No. Long Answer: Ummm... No. Suppose you could get Darwin going, but none of the higher-level stuff has been ported, nor is the source available.

But on the bright side, there are enough unix-derived OSes to choose from. And enough GUI's to choose from that should prove more useful/intuitive than the current release of Aqua.

You wouldn't be able to run any of the commercial Mac apps even if you could get OS X running on x86 hardware either.

Bruno