Awesome jParallax. I have been wanted to use this in my projects, but still haven't got the chance yet. It's a plugin and it's free.
- Canvas Photo
Create polaroid photo effect with HTML5 canvas. It also come with the export tool.
- Video showcase from Apple
Apple has a sweet demonstration of video masking, scaling and changing perspective of the video.
- Photo Gallery
Another awesome demonstration. You can change the layout of the photo gallery and it has a nice blur effect.
- Particle Animation
Using 300 sprites to spell out the word. It's the demonstration of canvas particle animation.
- Block based destruction of HTML5 Canvas Video
If you think apple's canvas video is awesome, check this out. Recommended to use webkit based browsers.