HTML

Javascript

HTML5

Smokescreen - Convert Flash to HTML5/Javascript

Music Notation with HTML5 Canvas

Embed Videos In Your Web Pages Using HTML5

HTML5 video Libraries, Toolkits and Players

HTML5 and CSS3 Checklist

html5media Enables <video> tags in all major browsers.

HTML5, again

How to use HTML5 in your client work right now

CSS

CSS3 Gradient Buttons

Super Awesome Buttons with CSS3 and RGBA