Well, Amazon uses the list-view in their search results. Never noticed this but now I assume that if they do it then it's been tested and deemed better.
Not exactly. Amazon uses list view if you do not select a department for your search. As far as I can tell, they use grid view if you do select a department. There must be something to that. I'd love to learn more about this if anybody has done extensive testing here.
Edit: It looks like there may be exceptions to the grid view within departments (see "Amazon Instant Video", "Books", and "Video Games").
