In the flash application on this page, Haruhi's eyes chase the cursor of your mouse:
http://b.bngi-channel.jp/psp-haruhi/sos_pop01.html
This is the demonstration of the "Motion Portlait" technology.
They say that the technology will be intorduced in the conversation system in the PSP game
"Suzumiya Haruhi no Yakusoku":
http://b.bngi-channel.jp/psp-haruhi/
The explanation of the technology was found on this page:
http://www.motionportrait.com/about/
According to the avobe page, Motion Portlait was consist of three key features:
1.3D model is generated from a single 2D image automatically.
2.Engine draw real-time image of portlait responding to input from the user.
3.Engine has also the capabilities of drawing emotions of the character.