CoolBook
I used to have a serious problem with my Macbook Air. After using the CPU intensively for a few minutes (e.g. watching a video) it would overheat and turn of one of the cores until the CPU usage fell to below 100%. Oddly enough when this was happening, the kernel_task process would be using 100% of the CPU. Installing CookBook has pretty much solved the problem, however with CoolBook the CPU temperature is now allowed to go to above 80C (were as before it’d never get above 75C).
