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from: http://setandbma.wordpress.com/2010/04/22/more-about-html5-and-chrome/

If you want to get a feel of what possible with HTML5 this is a good place to look it. here is the link (You can use left and right arrow key to navigate)

(maybe, that site has blocked, i've save it as following:)
http://n.certest.edu.cn/html5/index.html

It is one single page but it behaves like a presentation. It showcases enhancements in JS, HTML & CSS:
JS:
Client Side Storage (Web SQL Database, App Cache, Web Storage) - You can enter text which gets saved locally, you can create a local table
Communication (Web Sockets, Worker Workers)
Desktop experience(Notifications, Drag and Drop API) - drag-drop works beautifully - for text as well as picture
Geolocation
HTML:
Semantics(New tags, Link Relations, Microdata)
Accessibility (ARIA roles)
Web Form 2.0 (Input Fields)
Multimedia(Audio Tag, Video Tag)
2D and 3D drawing(Canvas, WebGL) - neat - you can rotate, pan, and resize photos
CSS:
Typography
Visuals
Transitions, transforms and animations

This reinforces my belief that HTML5 is going to be a game changer. Adobe should be worried - justification to use Flash becomes less and less! What about iPhone/ iPad native applications - what about Microsoft Silverlight? This will surely be a fillip to Web2.0 making it much easier to create RIA applications.