For what it's worth, Caravel, a buddy of mine who is a Linux/BSD admin for a media group phoned me up with excitement after trying his first OS X notebook. "You have no idea what it's like to have a Unix laptop that just works," he said. So clearly in the notebook space there is room for the hardware/software integration that OS X offers.

IN support of which, go to any Unix convention and count the OS X notebooks. There will be many.