EFB

it's a systray application which uses the smart battery support in Windows 7, Vista, XP and 2000 to monitor power usage, battery charge, CPU speed, CPU usage, and power events such as standby/hibernate/resume, battery events, etc. Additionally, it's capable of monitoring CPU temperature (via Intel Core internal sensors, or ACPI thermal sensors), hard drive temperature (if the drive supports it), and even control traditional hard drive APM/AAM/spindown settings, like the Hitachi PowerBooster does. The binary is about 320KB and though it comes with an installer, it requires no special installation, dll's, etc. It can be autorun from the registry with a checkbox. It can run with or without administrator privileges, though certain functions will be disabled without it.