I saw a study a while ago where someone had tracked where people look onscreen for various types of help - I seem to remember that, for example, they looked to the right of the question for help on a form for instance, and at the bottom of the page for 'about us' type info? Can anyone remember/ help me out? I am trying to find a shorthand way to explain best practice, to help me steer a stakeholder away from wanting generic marketing spiel about 'how this site works' info front and centre when a customer is on task.
I woudl look at Nielson Norman group work see this site where they have a number of eyetracking reports, and they do quite a lot of the eyetracking work. I cannot find anything that directly relates to what you are after, but you might be able to find something that works for you.