Personally I never thought that Brainbench certification would help in career. In July 2004, Brainbench has announced free tests for certain duration and I'd just took PHP 4 examination. Surprisingly I scored only 4.53--though the score is less than what I expected, I could get Master certification there! It was really a good experience.
Recently, I'm very much surprised by the fact that many employers are contacting me by looking at my Brainbench transcript. Brainbench really rocks!
Here is my semi Brainbench referral link, which may not work, but I'm interested to test it.