Patently Apple keeps an eye on all of the patents coming out of Cupertino, California, and they've been seeing a lot of patents for a 3D interface for Safari. This does not mean that you'll be wearing special glasses to do web browsing; instead, it describes a way in which existing Apple patents can be used in a GUI to overlap and stack windows and content.
The website describes several uses of 3D stacking to provide a different web browsing experiences. First, there's a discussion of "Rotating Titles of URLs, Emails, Documents, Apps"
