Xgl

Modern graphic cards consist of 90% 3D hardware and 10% 2D, just for the sake of backward compatibility, but so far only the games used the 3D hardware !

Here comes Xgl. Instead of having boring 2D windows, it uses full 3D to achieve a lot of cool effects, some of them ever actually useful:

• multidesktop cube
• real transparency (alt+mouse wheel over any window), if you have too many windows open
  
• instant zooming by mouse wheel (so useful for webcomics that have small fonts)
• and of course plenty of eye candy :-D
  

The cool stuff can't be presented on a screenshot, you simply have to try it on your own. Or at least watch a movie.

Unfortunately, Xgl is still quite difficult to configure. The solution is, as usual, downloading a LiveCD. Kororaa LiveCD comes with preconfigured Xgl, it should work on most ATI, nVidia and even some Intel graphic cards. Enjoy :-)