One outgrowth of the 2nd Workshop on the Open Archives Initiative
(Geneva, October 17-19, 2002) http://library.cern.ch/Announcement.htm
is an online discussion of subject categorization for eprint archives
http://tardis.eprints.org/discussion/ . The site includes a list of the
of the categorization schemes that might be used and what appears to be
the most complete list of eprint archives anywhere, labelling each archive
with the software creating it, the kind of subject categorization it uses,
and its type (institutional, disciplinary, or both).
http://tardis.eprints.org/discussion/eprintarchivessubjecttable9103.htm