While it is true that the OLPC is using Linux, many of the features of Bitfrost http://radian.org/~krstic/bitfrost_2007.pdf http://radian.org/~krstic/bitfrost_2

While it is true that the OLPC is using Linux, many of the features of Bitfrost http://radian.org/~krstic/bitfrost_2007.pdf http://radian.org/~krstic/bitfrost_2007.pdf are not present in mainstream Linux distributions (e.g. applications being isolated against each other (yay); theft detection using a central activation server (yay?)) The Bitfrost architecture follows strong requirements regarding the ease of use of security mechanisms (e.g. no user passwords, no reading required). Perhaps Apple just tries to get someone smart for the necessary security improvements who aims for a slightly more pleasant user experience than UAC.