Websites
CPAN Testers
Currently there are two sites. The old version:
http://testers.cpan.org/
and the new version:
http://cpantesters.perl.org/
Take your pick until the old URL gets repointed in the DNS.
CPAN Testing Statistics
Using the data provided from reports since 1999, statistics have been accummulated to show changes in the CPAN testing experience. These graphs and leaderboards are available at:
http://perl.grango.org
Although there are many platforms and perls covered, they do not cover the full matrix. If you have a machine and the time to set yourself up as a CPAN Tester, we'll be please to see you add to the statistics.
CPAN Availability - Cross Platform Statistics
Gabor Szabo created a collection of pages which identify the version of a particular distribution available on a specific version of Perl and a specific platform.
http://www.szabgab.com/cpantested/