We all know for the most part that screensavers are basically useless.  Hell if you leave the default energy preferences in OS X your screen turns off before a screensaver runs away.  Screw that!  Screensavers still have the use of being cool. 

Here is a list of screensavers that are as awesome as they are useless.  Enjoy!  [ Editor's Note: ...I should say that although these may have a windows or linux version, I don't know or care since all I use are macs.  Feel free to berate me in the comments. ]

1. Mr. Sparkle! Screen Saver: This, the king of screensavers, displays Mr. Sparkle dancing across your screen along with the Japanese tag line: “I am disrespectful to dirt”
   
   http://home.comcast.net/~jeff.ulicny/software/screensavers.html
2. SurveillanceSaver: All this little beauty does is show screenshots from any of the number of open Axis security cameras floating out there on the pipes. Feel free to learn more about these open cams through our archives!
   
   http://i.document.m05.de/?p=418
3. 
   Defcon Screensaver: You aren’t l33t until you install this kick ass old school rotating globe on your h4x0r b0x.
   
   http://www.ambrosiasw.com/utilities/freebies/
4. 
   Red Pill: How can one do a “cool screensavers” list without at least one Matrix screensaver?
   
   http://www.macupdate.com/info.php/id/11727
5. 
   Flying Toasters: Last in this list, but always near to my heart…Flying Toasters. Recently it was lovingly brought back for OS X (in both classic and modern versions) and its been on all my Macs, both home and office, since. …ok all these screensavers are on all of my macs, but this one is just great because its the god damn flying toasters!
   
   http://uneasysilence.com/toast/

If you have your own all time favorite thats still out there for others to install, by all means get your pudgy fingers a typin’ in the comments area.