Papervision3D is a high performance 3D engine for Flash. It features linear texture mapping, optimized for rendering speed and quality. It has been designed to be simple and easy to use.
Papervision3D is in public beta and available on Google Code under the open source MIT License. The project has a Wiki and a Blog as well.
Check out these stunning demos to get a glimpse of the possibilities:
Papervision3D based rich internet applications would look amazing on these real 3D displays!