[jyl]

Apple said today that Mac OS will only run on Apple machines.

They have done the "clone Mac" thing before, it was one of the first things that Jobs killed when he returned.

One reasons Macs work so well is that Apple is responsible for the whole thing - hardware and operating system and increasingly the software too. With PCs you have Intel making the chip and Dell making the box and Microsoft making the O/S and whoever making the application and you end up hunting all over for the missing driver or patch.