http://geekfeminism.org/2009/11/29/questioning-the-merit-of-...
Personally, I think you need a pretty mixed group of people in charge of hiring in order to get anywhere near to a fair and balanced process. It's too easy to discount racist or sexist hiring practices (either subconcious or overt) under the guise of wanting people who "fit with the team's culture".
While merit plays a role, pretending that before affirmative action hiring was merit-based is naive at best.
Given this, I'd like you to please consider that the perception that a specific gender or race is worse at tech may be a bigger influence in an interview than the objective merit or lack thereof that candidate has (something that's impossible to measure in knowledge-work anyways).