Actually, I believe that official documentation label the underlying system as Debian from last I read.
I will agree that It's totally differant than the old MacOS (I can't stand it); the new system has a great deal of improvements that wowed even myself

...
I had to play with the first version and Jaguar at Adobe, I hadn't gotten my mits on Panther though..
But I will definately agree with you that they actually spent some time on it for once
