W3C have a new logo:

Eric Meyer wasn’t late to create an HTML5/CSS3 version:

http://meyerweb.com/eric/html-xhtml/html5logo/
(logo will be displayed very well inside Opera, Firefox, Safari, Chrome…)

Also interesting to take a look at this HTML5 logo generator, made by Daniel, with the <canvas> html element:

http://people.opera.com/danield/html5/html5logo/
(for best design/functionality experience, open in Opera 11.)

:-)