Colour screens require a lot of energy, thus Palm devices with a colour screen usually won't run as long as devices with a monochrome screen. Therefore it is important to find ways to save energy to gain more time with one battery pack or one charge.
One important feature to save energy is the "Auto-Off" setting. A lot of users use only up to three minutes for this value. But especially Palm users attending meetings using their Palm as a mini-notebook know that there are several occasions where they are not entering anything for a period longer than 3 minutes. This usually means that they have to turn back on their Palm several times each meeting, which is counter-productive and might have other side-effects. For example the screen of the Visor Prism needs some time after being off for a while to get back to its full brightness.
Energy Dimmer tries to solve the dilemma between having to choose a small auto-off value and the wish to use a bigger one - without losing more battery power than necessary. It achieves this by implementing a ``dimmer''. That's a mechanism that can be found on (some?) WinCE devices, too (e.g. on the HP Jornada 620). After some time of inactivity, the device will reduce the brightness of the screen, reducing energy consumption significantly.
Dimming the screen before shutting the device off and using a higher auto-off value has another advantage: you can undim your device by simply tapping anywhere on the screen or pressing any key on your keyboard. Thus you save the pressing of the power button and can continue to work in an instant. Plus, the screen won't need time to return to full brightness after having been switched off and cooled down.