Results of XKCD Color Survey
blog.xkcd.com
blog.xkcd.com
I see no reason for the qualms in putting it in the shop as a poster. (I also contributed a few answers.)
P.S. A few years ago, Tim Bray took a whack at slicing through the RGB color cube: http://www.tbray.org/ongoing/When/200x/2004/05/19/RGBPlane
As an interesting follow-up - this is a 'Munsell Hue Test', the aim is to order the colours by hue: http://spectralcolor.com/game/huetest_kiosk
However, I would have liked to see the percentage of each gender who participated in the survey.
From the color names page