HoloToy uses iPhone 4 front camera to create 3D effect
Kode80's HoloToy app uses the iPhone 4's front facing camera and accelerometer to manipulate 3D images according to your angle of perception, giving a three-dimensional effect without special glasses.
http://rss.macworld.com/click.phdo?i=fcb2989845dd4f3c91136a07eb1c5a41