Can I start using Html 5 on our websites? Or is it too early to use it?
I see that Google is using Html 5 for their images site. If google can use it, I guess, we too can.
['https://Stackoverflow.com/questions/7964512', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/336191/']
HTML5 is many things. If you're asking, "Is every feature of HTML5 ready for the web?" then the answer is and will be *no* for a long time.

Instead, if you're asking "Can I use these cool HTML5 things like `<section>` elements, canvas, CSS3, custom fonts, and local storage?" then the answer is *yes*. The best source to guage support of HTML5 features is [caniuse.com](http://caniuse.com/), which also includes links to [shims or polyfills](http://remysharp.com/2010/10/08/what-is-a-polyfill/) for browsers which don't support the feature.
The answer is: yes, you **should**.

Please read [here](http://coding.smashingmagazine.com/2010/12/10/why-we-should-start-using-css3-and-html5-today/), and [here](http://www.standardista.com/yes-you-can-start-using-html5-today/).