From Eeebuntuwiki

Contents 1 Eeepc Tray 1.1 Then Left Click to Change the CPU scaling in use 1.2 And Right click to see the toggle options. 1.3 1.4 1.5 Further Configuration

Eeepc Tray

Eeepc-Tray is the App you see in the top corner of your screen on Eeebuntu 3.0. This Handy little program lets you toggle things such as The Webcam and Bluetooth on and off. You can set the CPU speed and even configure the ACPI.

Using the Eeepc tray Couldn't be easier 

Simply Roll your mouse over the Little Eeepc logo and get some useful information

 

Then Left Click to Change the CPU scaling in use

And Right click to see the toggle options.

Further Configuration

If you fancy configuring your acpi further you can have a look at the offical wiki HERE which will give you a full overview of how to edit the configuration file. This will let you have different programs launched from the Silver Keys at the top of your Eee (if you have them!)