ONE
pages where every dang pixel is "sensitive". No matter where you put your mouse, something happens. Whitespace that has hover effects. Things that fling onto the screen when you hover over nothing in particular. Ever try to switch windows by clicking into what you think is some harmless space, and find yourself waiting to see a lightbox popup, or unknowingly sparking an advertisement?
TWO
Pages that are so saturated with features that they become a nasty mess. Pages that have 100K of markup, 20K of images, and 450K of JavaScript. I don't really need to see a toolbar, details, features, other products, sponsored links, more products, a tagger, a comment zone, a rating widget, more reviews, some discussions, listmania, guided search results, other categories, feedback, my recent history, my recent searches, and another nav menu all on one page.
AMAZON, ARE YOU LISTENING?