The current list can be found at CPAN/CPAN.html on these sites.

Also see Tom Christiansen's CPAN multiplexer at:

http://mox.perl.com.

Africa
South Africa              ftp.is.co.za

Asia
Hong Kong               ftp.hkstar.com
Japan                ftp.lab.kdd.co.jp
Taiwan          dongpo.math.ncu.edu.tw

Australasia
Australia            coombs.anu.edu.au
                    ftp.mame.mu.oz.au
New Zealand         ftp.tekotago.ac.nz

Europe
Austria               ftp.tuwien.ac.at
Czech Republic     sunsite.mff.cuni.cz
Denmark                 sunsite.auc.dk
Finland                   ftp.funet.fi
France                      ftp.ibp.fr
                       ftp.pasteur.fr
Germany                    ftp.leo.org
            ftp.rz.ruhr-uni-bochum.de
Greece                    ftp.ntua.gr
Hungary                   ftp.kfki.hu
the Netherlands          ftp.cs.ruu.nl
Poland                   ftp.pk.edu.pl
                   sunsite.icm.edu.pl
Portugal              ftp.ci.uminho.pt
Slovenia                  ftp.arnes.si
Spain                   ftp.rediris.es
Sweden                    ftp.sunet.se
Switzerland              ftp.switch.ch
UK                     ftp.demon.co.uk
                     sunsite.doc.ic.ac.uk
                      unix.hensa.ac.uk

North America
British Columbia       mango.pinc.com
California            ftp.digital.com
                         ftp.cdrom.com
Colorado           ftp.cs.colorado.edu
Florida                ftp.cis.ufl.edu
Illinois         uiarchive.cso.uiuc.edu
Massachusetts          ftp.iguide.com