I was just thinking, that would really be a good place for it to be (I'm talking laptops). It always seems stuck off to the side and looks ugly. Plus wouldn't it be better to have it check who you are before you can really turn it on? I suppose you could still take it apart and everything and hack in that way, but still. Same with the iPhone's home button. If people knew they couldn't turn your phone on unless they took it apart, well, wouldn't that be less reason for a casual thief to steal it?