With Ubuntu 11.04 dropping the traditional GNOME panel many user-favourite panel applets will be going the way of the proverbial dodo.
Not so the CPU Frequency switching applet which has had an indicator make-over by Арт’м Попов.
The indicator lets you ‘change CPU frequency on-the-fly’ as well as using an icon – available in both Ubuntu mono light and Ubuntu mono dark, theme fans – to display the current resource usage. 
Download
The indicator is available to install via Artem’s PPA @ launchpad.net/~artfwo/+archive/ppa
As the PPA also contains a multitude of other packages users may wish to install via .deb instead.
Current .debs available