I have a BrainBench certification in Perl hanging on my wall in my cube. I took the test because it was free. I hung it up because I went to the trouble of taking the test, getting a certificate, and out of the four or five certs I got from them, it was the only one that wasn't embarrassing. Mostly I keep it around because it looks semi-official and gives me a chuckle once in a while.

It's certainly politically safer in the workplace than a certificate saying I'm Minister of the Universal Life church (which I don't think I am at this point, just an example). But I would never list BrainBench certification on my resume... I'd be a lot more likely to mention "active participation in the perlmonks.org online community" than a BB certification. Now if a prospective employer wanted me to pass one of their tests and was willing to pay the fee...