Wow. This video, Part 1 of a demonstration of the amazing BumpTop, isn't just another conceptual touchscreen interface pipe dream; it's actual downloadable software, albeit only for Windows.
BumpTop is a desktop environment, designed to enhance traditional computer desktop functionality by more closely supporting the normal behavior of a real-world desk. It is aimed at stylus interaction, making it more suitable for tablet PCs and palmtops.
In BumpTop, documents are described by three-dimensional boxes lying on a virtual desk. The user can position the boxes on the desk using the stylus or mouse. Extensive use of physics effects like bumping and tossing is applied to documents when they interact for a more realistic experience. .
BumpTop currently supports Windows XP/Vista/7, and Mac/Linux will potentially be supported in the future.