https://www.google.com/#hl=en&gs_nf=...w=1920&bih=967

He linked to Google because so many websites and blogs have listed all the HTML5 features and difference already.

HTML5 mainly introduces new tags and it's backwards compatible. Meaning all your old websites will still work perfectly on new browsers using HTML5 standard.
Only difference is, that for developers many new tags have been added which make it easier to implement things that so far required workarounds or some messy alternatives.
One of the big things in HTML5 is that is can stream videos natively without the need for a flash player.

There is a section called Articles... for those of you that like to post "articles" here. Just saying...

HTML 5 is the latest version in HTML and it inherits all the properties of the HTML earlier versions and in addition to that some more tags as stated by "sportmans" are added.

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HTML 5 is just awesome, i develop 4 websites on the HTML 5 and it is quite good coz it removes all the work of javascript and provide universal standar format in one file called CSS from where u can edit ur whole body and structure of website. Gives full support any type of flash and functions related to flash with short codes.

Here you go : HTML5 Presentation

That link would cover everything. Further also checkout their root domain : HTML5 Rocks - A resource for open web HTML5 developers

Read everything on that site and you will be good to go with HTML5

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