I looked around to see if anyone had mentioned this before, but I found nothing, so I apologize if this is common knowledge.
I recall reading a recent interview with St. Larry Wall and he was briefly questioned about Perl certification. He said that he wouldn't want to be responsible for any such certification, and I figured that'd be the end of it for now. I have since discovered that there is a certification of sorts.
I recently noticed that Brainbench has a Perl certification test, and while anyone who has been to Brainbench knows their certs aren't worth much, it's still something neat to stick on the wall. The tests cost $25, and the certificate you receive is actually pretty attractive. Check it out if you're in the market for some wall-dressing.
-- Programmus, ergo sum.