I find your comment rather astute. I have great eyesight and a high resolution monitor, but these diagrams are too busy to really be practical on a conventional PC monitor at this time.
The Amazon mockup is a great example. It uses 50% more screen real estate and nearly illegibly small fonts. I can hack it on my 1600x1200 monitor but that would be hell on a PC running at 1024x768 with low color depth (or no anti-aliasing) and a bunch of spyware/toolbars installed.
Amazon also uses the data from people clicking links and browsing to analyze customer preferences. You can't do that with all of the data on one screen.
