I thought it was kinda cool:

p5-Convert-IBM390-0.20 Functions for manipulating mainframe data
Long description | Package | Sources
Maintained by: dev@fenux.net
Also listed in: Perl5

Back in August, I submitted a port to the FreeBSD ports tree because I was tired of having to rebuild it with CPAN every time I upgrade Perl on my boses. This way I can just use portupgrade to rebuild it when I upgrade Perl.

As a side note, I just submitted two more ports from the CPAN database for the same reason.