Start using HTML5 today!

I read another great article about "Should
be using HTML5 today"

The author says the following on why web developers should adopt HTML5 sooon,

Despite all the hype about HTML5, there are still many people (mainly web developers!) out there who are wondering whether or not they should use it in their next site. The main issues seem to be browser compatibility and the myth that HTML5 won’t be ready for mainstream usage until 2022.
To begin with, let’s bust this myth once and for all. For any specification to be deemed “ready”, it supposedly needs to be fully implemented in two browsers. If this rule was true, CSS2.1 also wouldn’t be “ready”, and do you hear people advising you to hold off on using that? No, and quite rightly so too. And the same should go for HTML5.

As for browser compatibility, the latest versions of browsers such as Firefox, Chrome, Safari and Opera all support various parts of the HTML5 specification, and older versions of these browsers support bits of the spec. The major headache, as always, is Internet Explorer. However, with the upcoming release of Internet Explorer 9, which will support HTML5 features, this is improving. That said, there will of course be many people who remain on older versions of IE and how will they cope with HTML5?

He concludes in the following way,

There are a whole host of websites out there using HTML5 already and most of them work just fine. There are sites out there dedicated to showcasing websites using HTML5, such as HTML5 Gallery and 101 Best HTML5 Sites. They’re well worth taking a look at to see what others are doing.

Personally I think that there’s nothing to stop you from going out there and using HTML5 today in your websites. It works now and is only improving. So the answer to should you be using HTML5 today is a resounding yes!

Do you have any specific reasons on why to use or not to use HTML5?