The Perl bindings are distributed within the main GDAL source distribution but they are also available on  CPAN as  Geo::GDAL. They are maintained by Ari Jolma.

The README:  https://svn.osgeo.org/gdal/trunk/gdal/swig/perl/README

The documentation can be seen at  http://map.hut.fi/doc/Geo-GDAL/html/