Check out these Web Pages that make nice usage of the Hue system:
A nice little game made in a 24 hour game jam. Works in most browsers (not IE). If there is a reachable bridge on the network you will see a 'Hue' icon in the bottom right corner.
Experience the lights and sounds of Inamuragasaki, a beautiful cape in Kamakura City.
A nice local web based portal.
Control Philips Hue lights using color theory. Works on mobile!
The first music Hue webapp that actively detects the beat of your music and synchronises it with your lights.