I would like to announce that there is an updated version of the Global Protein Surface Survey (GPSS) PyMOL plugin available for download at http://gpss.mcsg.anl.gov. The new version retains all the functionality of the original plugin with the ability to allow users to upload their files (in .pdb format). Alternatively, you may upload files directly from the GPSS website and visualize the results from the site and/or using the plugin.
The upload has worked reliably during testing, but it is still considered experimental. Please let me know of any troubles you have using it.