Here is my Aero System Load Gadget for using with Rainmeter. It shows the utilization of CPU and RAM. It displays up to 12 cores at once.
This skin is avaiable as .rmskin-file!
Install:
Just double click on the "Aero Drive.rmskin" file to install it.
Rainmeter Version 2.1 Beta and Windows Vista/7 are needed to use this Gadget properly, because of the Blur-Effect on the gadget and in the options dialog.