http://thegoodman.cc/ CSS Animations Audio No Images
http://www.dieselblackgold.com/ Impressive responsive website. Very classy, with some css transitions and sleek modern design.
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We Are Not Fond Of Cold Weather 22squared writes about who they are not.
http://www.flashvhtml.com/ These flash game creators re-created the same game in HTML5 and measured the performance. The website is stunning, all html5, works flawlessly on iOS devices. Most impressive website I've seen so far! Yes, Flash is dead.
http://whiteboard.is/ One more for the series "why use an image when you can use a video" I have seen fixed image backgrounds that bleed through semi transparent layers before, but this is the first one I see with a video.