Use Tilt to view web pages in 3D
This is an oldie but a goodie. I saw the release of Tilt last year, which is a Firefox addon. Tilt allows users to view any web page and spin, turn and tilt it with a three dimensional view. If you double click on any of the 3D nodes, you can view the element information which is helpful as well. But just for the sake of seeing a web page in 3D is pretty cool.