Links are, uh....fatter. As in the new grey menu bar at the top of the main page.
Quicktime movie trailer page is now big old thumbnails instead of lists.
There is ubiquitous use of that top horizontal scrolling layout, ala (originally) Aperture and now appearing everywhere.
Hmmmm, pretty handy way to get around for a handheld device with a touch screen and "flick" scrolling, no?
I get the feeling that the web redesign (as well as some of the Leopard UI elements, particularly in the finder) are aimed squarely at extending the Mac paradigm into the handheld and touch screen space with a unified, "across all platforms" use of UI metaphors.
So that the iPhone can conveniently handle the "chunky" "cover flow-y" first layer while desktop and laptop users can go from there into the finer grained stuff.