browsee - 6:48 pm on Apr 14, 2011 (gmt 0)

blogcritics.org/ -Dark background colors
www.reghardware.com/ -Dark background colors
www.pcadvisor.co.uk/ -Dark background colors
www.just-food.com/ -Dark background colors
www.cinemablend.com/ -Dark background colors
www.digitaltrends.com/ -Dark background colors
technorati.com/ -Dark background colors + ads above fold
www.daniweb.com/ -Dark background colors + thin pages
popcrunch.com/-ads above fold
www.computerweekly.com/Home/ -ads above fold

Google is asking machine to understand and implement user behavior patterns. Google algo is like Watson.

I studied human behavior, dark colors are often seen as a color of rebellion. Normally(age 30+) avoid dark background colors(Young prefer dark bg colors).

I may be wrong, but I still believe that background color is one of the important factors.