• Back in the days of CRT monitors, a screensaver was necessary to protect your screen from "screen burn." Screen burn occurred when static images were left on a monitor for too long, resulting in a permanent ghost image of whatever was on the screen at the time. While screensavers may not be necessary for protecting our monitors, they can still help to provide some security to our system and a much-needed break for the eyes. No matter what your screensaver needs may be, there is a good chance you will find something to your liking on the World Wide Web.
  
  

Data Screensavers

• If you're looking for a graphic-based screensaver that provides helpful or interesting information while it runs, consider downloading a screensaver like PolarClock or Twingly. PolarClock is an attractive, working clock that registers the passing of time according to polar coordinates, and Twingly provides 24/7 real-time monitoring of the world's blogosphere activity. Screensavers like this can be almost as interesting as the work you're supposed to be doing.
  
  

Abstract Screensavers

• If flowing colors, shapes and designs are more your style, then an abstract screensaver will probably suit you. Abstract screensavers come in many varieties, but their key element is that they provide hours of randomly generated graphics that can help soothe a busy mind. Check out Quartz Composer, which comes with several adjustable pattern generators, or Skyrocket, which simulates digital fireworks on your desktop.
  
  

Text-Based Screensavers

• Sometimes, all you want is to put up your own message, or to read the inspiring words of others. Text-based screensavers can take various quotes and phrases and output them in a way that is pleasing to the eye. Mac's Tiger RSS screensavers keep updated on news and information from your favorite RSS feeds, while Mapped Up will show you random RSS data and map where it came from on a digital globe.