Rendering Synthetic Objects Into Old Photographs
First time accepted submitter IDarkISwordI writes "A new abstract headed to SIGGRAPH Asia 2011 provides a method for rapid execution of computer graphics, synthesized into photographs with accurate lighting and physics based on limited input from a user and interpretation by their code." The results are impressive; hard to watch the video demo (on linked page) without boggling.
This is going to be very useful for real estate sales. No need to move furniture into an empty house for the pictures.
Especially getting the lighting and the shadows to fit the rest of the image.