Strawberry Perl is a relatively new competitor to ActiveState Perl.
Strawberry includes MinGW (a port of the GNU compiler tools) and MSYS (a port of the bash command line) which run directly as Windows programs -- in contrast to Cygwin which is a separate environment. Yes that means you have 'make' and 'gcc' on Windows directly now!
Strawberry runs under 64-bit Windows 7; ActiveState doesn't yet. Strawberry installs even the latest modules from CPAN; ActiveState has precompiled 'ppm' modules which do not include the full CPAN complement nor the latest additions or updates.