Control Your Kernel With Pimp My CPU OC/UV Tool
If you want to have a bit of fun with your kernel, check out XDA forum member Cpasjuste‘s app, Pimp My CPU.
Pimp My CPU is a tool developed by the XDA dev after installing CM7, with (currently) limited functions, to change the maximum and minimum frequency depending on the kernel capability and to lower voltages.
Similar to Voltage Control by XDA member xan, Pimp My CPU lets you apply the settings on the fly or save them to be applied at boot.
The app shows a green image when a frequency is enabled, else it will be gray/blue and when an undervoltage is enabled or spotted, the setting will be green too.
For more information including to download the apk file, head on over to the application thread.