It's already in iOS.It's not just that. We need a resolution independent web to form too. One where, you can scale the website larger and graphics don't become pixelated, or increase the font size and tables and layout retain their proper form.
It's not. iOS allows free zooming/scaling, but you still get pixelated graphics once you zoom in to a point. Obviously far less noticeable on the size of the iPhone's screen, but with the iPhone 4's resolution, it is still noticeable.