<< But I know it's basically a BSD based kernel with a really well built GUI on top of it. I'm curios about it, and wondering if you have any info on it? >>
Not really. I've just played with OS X for short periods in the store and a couple of other places. But it does seem very nice, with a few annoying features. Can't really comment on stability, but my friends who use it state that the beta is much more stable than the release version of OS 9, although there isn't all that much software out for it.
I can't really tell you much about the technology behind it. However, it does seem according to the reviews that OS X makes a Mac competitive vs the PC for gaming. OS X is more stable and supposedly roughly 20%+ faster than OS 9 for Quake III Arena. (OpenGL is built into the OS.) Judging by the numbers though, it still ain't as fast as Jobs advertises obviously.
If the Ti G4 PowerBook had come out earlier, and if it shipped with OS X, I would have bought it. However, neither is the case, so I bought a PIII 600 laptop instead. But I sure as hell ain't putting XP on it for now.