Eyetools, Enquiro, and Did-it uncover Search's Golden Triangle
http://www.eyetools.com/inpage/research_google_eyetracking_heatmap.htm

Edwards, Greg
Eyetools
2005

Abstract:

The vast majority of eye tracking activity during a search happens in a triangle at the top of the search results page indicating that the areas of maximum interest create a 'golden triangle.'