Centre for Atmospheric Science at the University of Cambridge, UK.  Visit their web page called "The Ozone Hole Tour".  You'll learn about the discovery of the ozone hole, how the ozone hole has changed since then and what the latest research is concerning the ozone hole.  They have a cool movie showing changes in the ozone hole over a 13 year period.

Polar Meteorology Group at the Byrd Polar Research Center (Ohio State University).

Upper Atmospheric Science Division of the British Antarctic Survey.  Check out their "Geospace Tour".