Attention to Detail
As I explained earlier, I think it is really important to go beyond the specs. It's really important to put care and attention in your product. The new version of iTunes has a great (little) example of what I mean. I use Itunes to play music through both the computer speakers and a stereo in the livingroom, connected to an Airport Express.
In iTunes 7, when I added the Airport Express to the set of outputs while playing a song, the music stopped, and after a while resumed playing through all the selected outputs. I never minded the short silence, and was amazed at how Apple got all the outputs to play perfectly in sync.
In iTunes 8 things changed a tiny bit. When I select the Airport Express, the music keeps on playing on my computer, and after a few seconds the music also starts playing from the speakers in the living room. An still, the music is in sync.
It's these little things, the amazing attention to detail, that give Apple products a tremendous "perceived value".
That, and the Genius button ofcourse. :-)