Sparkle is a screen saver I wrote.  Up to 100 stars appear at 
random on your screen. They appear, grow, shrink and disappear. 

There are 6 cool things about sparkle.

cool #1 - It catches the first keystroke.  You don't have to hit a
   key and then start typing your password.  This is the way
   Mac screen savers work.

cool #2 - It doesn't respond to mouse movement.  The screen saver won't
   pop off because you bumped the table or accidently moved the mouse.

cool #3 - You can't switch or boot out of it.

cool #4 - Uses the same password as all your other screen savers.

cool #5 - You can set it so it won't come on while a particular com port
   is in use.  i.e. you won't be interrupted while online.

cool #6 - Makes an icon of the screen saver.  So you can instantly launch
   it with a double click.  You can make program items of all your other
   screen savers too.