Jakob Nielsen’s “Preparing a Website for the Holiday Shopping Season” makes a great point that site architects often forget — with the rise of search as the dominant traffic generator on many sites, it is now possible for most of your traffic will not be coming through your home page and other key landing pages. That means that every page has to do double duty. First they must cover the topic under discussion so that you add enough value to get the search listing in the first pace and deliver the value the user was seeking. And secondly, pages must convey why your site is a trustworthy source and ask for the sale (whatever that may be).
As Jakob states: “A website is like a house with a thousand front doors: visitors can enter anywhere.”