The Basic X server

An xterm. Quite readable. Not very wide, though

Xterm with a smaller font, to get more text on screen

olwm. Again, quite readable. Not really enough desktop space for it to be useable though

Enlightenment starts up...

Enlightenment

Yes, I am sure I wish to log out

Netscape Communicator

RealPlayer 8

the "gears" GL-based screensaver

sproingies, another GL-based screensaver