>>That said, the browser interface is a document-centric. It lends itself to the use of a mouse.
>
>That's a contradiction in terms. Document-centric interfaces should not depend heavily on the mouse, in my view. Do you use the mouse a lot when you're working in, say, Word? I keep my hands on the keyboard there.

Very interesting discussion...one point I would like to add: from a user POV, the one thing that really irks me is GUI that requires frequent switch from mouse to keyboard and back. Give me constant mouse, or constant keyboard, but please don't make me switch back and forth all day.