The site "WebPlatform.org" was introduced to collect best practices for new web technologies like HTML5. Many major vendors are contribute to the platform, e.g. W3C, Google, Microsoft etc.
Worth to take a look at.
To understand the state of the technologies so far - the site is provided as HTML5 - but try to play the intro on the homepage...still Flash on FF16 (yes I know it is simple a YouTube hosted video).
Time will change...