actually screensavers don't ease the burden on your system, nor are they really necessary if you have a Flatscreen monitor. They are there for CRT (cathode ray tube) screens, if you have a high contrast image, like white text on a dark field, the guns are bombarding the phosphorous coating with ions and over a period of time will permanantly burn the image on the picture tube.

it's actually surprising how many screensavers aren't proper screensavers. If there is a non-moving area, like the coral in the MS underwater ss, that is still going to burn into a CRT.

just a tidbit.