Another one of my permanent sidebar gadgets in Windows 7 is from the Windows 7 Personalization Gallery gadget section – the All CPU Meter:


This gadget adapts based on however many cores you have, up to 24, and allows you to keep an eye on the level of work your processor is doing.  It also tracks your RAM usage, shows your CPU clock speed and the graphic changes to show the manufacturer of your processor.

The author of this gadget provides a great breakdown of the entire gadget interface:


Download the All CPU Meter