I think the question is how important is certification at large corporations, where candidates have to make it through a non-technical Human Resources layer.
I have seen where having Cisco certification can help for networking jobs and having SANS certification can help in the security field. And there are also the vendor ones where if your company has X number of certified personnel they get some extra discounts.
But as far as Perl goes I do not think any certification out there is well known enough or respected enough to matter. If you do want to pursue some certification look for something that compliments your Perl skills.
