CpuIdle Pro for Windows NT/2000 5.9 Final Beta
Source: BetaNews
CpuIdle lowers the CPU temperature by disabling it when not needed. This prolongs the CPU life (a decrease by 10°C doubles the life span) and cuts power consumption. By decreasing power consumption it increases the time before your laptop battery goes dead. Unlike normal power management CpuIdle is active all the time and works even when you're actively using your computer.