1) Amazing game developed with html5 (without any flash)
http://www.kevs3d.co.uk/dev/asteroids/
2) 12 Examples
3) HTML5 Demos
4) HTML5 Image uploader
http://demos.hacks.mozilla.org/openweb/imageUploader/
5) A list of html5 bookmarking
http://delicious.com/khalweir/html5
6) A good HTML5 implementation
http://www.nissanusa.com/leaf-electric-car/
7) Basic video player
http://htmlfive.appspot.com/static/video.html
8) A simple game
http://www.benjoffe.com/code/games/torus/