PyMOL under Windows 2000.
The challenging thermophilus 30S ribosome structure (1FJF) has nearly 52,000 atoms, but PyMOL loads this file in under 4 seconds and delivers smooth rotations.

Click this link to see a comparison of how some of PyMOL's FREE competitors stack up with 1FJF on Windows 2000 as of 9/20/2001:

PyMOL running full-screen under Windows 2000.
Instant and reliable full screen rendering is one of the big advantages of running under windows, particular when giving presentations. You can even disable the internal GUI for maximum-visibility molecular graphics.

PyMOL running under RedHat Linux 7.1/Gnome.
The nVidia drivers work spectacularly under Linux!

PyMOL (software-rendering) running under Darwin/XFree86 on an OSX Mac
Screenshot courtesy of Michael Love.

PyMOL (hardware-accelerated) running under Mac OS-X.
This version isn't yet ready for production use

PyMOL running under SGI IRIX.
The historical visualization platform. Hardware stereo works great on SGI's capable of quad-buffered stereographics.