It’s refreshing to take a Dive Into HTML5.
Reading the HTML5 spec is even more fun. It’s only 600+ pages after all … :)
My personal “IT résumé” website at oliver.doepner.net has recently become HTML5 compliant (using W3C validator). It was mostly a matter of changing the doctype and cleaning up the existing XHTML somewhat.
While I was at it, I also added in some CSS3 to make it look a little nicer. The result is tested on most browsers.