The new public beta release of Safari 4 reveals the deepest look yet at the future of Apple's software, hinting at what's in store for the closely guarded user interface revamp coming in Mac OS X 10.6 Snow Leopard, as well as appropriating ideas from other browsers and adding some original flourishes, some of which go boldly and decisively past the company's existing human interface design guidelines.

Apple's Safari 4 UI changes hint at plans for Snow Leopard