If you own a MacBook and are plagued by a random shutdown, Apple this week released an updated firmware for the laptop. To fix the random shutdown issue, it provides an updated SMC monitoring utility that includes fan speed control. The original flaw may actually be a hardware defect, but not one so severe that a software workaround isn't able to fix it. Apple isn't releasing precise details as to why, though.
One complaint some MacBook users have is how hot it gets, which the fan control utility can help if you so wish, to adjust the minimum fan speed. If you using OS X 10.4.8, you can install the firmware, otherwise you will need to update to 10.4.8 first.