Hudson-Powell Interactive Installation

Not a new idea, but really well done and very fun and beautiful. Created for a Hello Kitty exhibition in Hong Kong, this installation tracks user movements in front of a projected screen and renders an alternative cartoon head onto the head of the person being filmed in real time. The installation was created using ARToolKit Augmented Reality software.
See the video on their site.

Japanese Web Designer

Fun interactive toys from this Japanese web designer.

Cover Pop Music Visualiser

A beautiful flash animation that generates music and visuals based on variants of simple mathematical algorithms.

View here.