A new job listing from Valve Corporation seeks to hire a psychologist to help them develop new technologies (thanks GameSpot). They list various areas a qualified candidate could help with, though it doesn't say whether their new hire could help uncover the reasons behind their aversion to the number three:

Here are a few ways you could utilize your knowledge of experimental design, research methods, statistics, and human behavior to help us:

• Craft compelling gameplay experiences for future Valve titles
• Provide insights on human behavior to improve customer experiences on Steam, our game distribution platform
• Conduct statistical analyses on Valve's gameplay, financial, and company data to identify patterns of behavior
• Research compelling new hardware technologies
• Design experiments to evaluate various gameplay hypotheses and design choices
• Improve existing playtesting methodologies
• Develop innovative ways of acquiring data to answer questions about Valve's products and business practices