Red Giant Software released a application called Warp that allows users to add a shadow, corner point or reflection to video.
The Corner Pin plug-in allows you to take any video source, including warped video, and put it in a new place with proper perspective. The shadow tool gives users three points of control to set the shadow perspective and a fade control to create falloff. Obviously, the Reflection tool provides a mirror image of the piece of video you are working with.
Warp is available for $199 and supports After Effects CS3/CS4, Premiere Pro CS3/CS4, Final Cut Pro, Motion, and Avid AVX 2 systems.