Dock Meter shows your System CPU Load in the OS X Dock. You can adjust the update interval, so that the Meter does not put high CPU load onto your System by itself.
A friend of mine asked me to put this App into the App Store. In its current state it works fine but has not much options. I am thinking of adding more features like different designs for the Dock Icon, to this App.
If you have ideas for new features, please use the support Link to get in contact with me.