http://www.examine.com has proven that there's a market for user friendly, layman readable, scientific reviews of subjects where there's a lot of BS. This is also an area that could do significant good by shortening the time between scientific discovery and it's effect on people's decisions.

I've seen quite a few layman readable scientific reviews here on LW, and it seems a great business model for someone who likes that type of research.

Some potential areas for which you could start a website like this:

• Nutrition
• Exercise
• Happiness
• Longevity