When talking about Web page development HTML 5 is very important because you can make some top things with it. It's fast and clean, and if you combine it with CSS 3, there's a deadly weapon in your hands. You can develop almost anything from a video player that has been extended to a simple interactive game. This is amazing and I really hope that more and more web developers will adopt this approach. When it comes to content-rich apps, or complex games, I know it's not a flash killer right now, but I hope he will be in a very important position in the next few years.
Bomomo
Tunneler
Geolocation
Magnetic
Google Box
HTML5 Video Destruction
Sinuous
Cloth Simulation
Canvas Paint
Canvas gradient (move the mouse to change the color)
Lines go on the place
Drag and Drop
Editable Content
Two videos in sync
Storage Events
Pong 3D
Interactive Circles
Geoid Viewer
The WebGL Globe
Tron Tank Program
Typographic effects
Guess What Cup
Fractal Lab
Walking with CSS3
Core