All The Cheat Sheets An Up To Date Web Designer Needs: CSS3, HTML5 and jQuery
60 Useful Web Developer Cheat Sheet Collection
25 Useful Html5 Cheat Sheets and Tutorials For Web Developer
Responsive Web Design: Helpful Articles, Techniques & Tutorials
Anatomy of a HTML5 Mobile App
8 Fast and Furious Tools to speed up your CSS and HTML Coding Time
Safari Reference Library
The Safari Reference Library provides detailed information for web developers on iPhone, iPod touch, Mac, and PC. These resources include guides and articles, API reference documents, sample code, release notes, and technical notes. Use these resources to learn about Safari's developer tools, visual effects, HTML and CSS support, JavaScript and DOM support, and other features and technologies. The library is organized by Topics and Resource Types
HTML5 presentation
Online presentation of HTML5, CSS3 and Javascript's new APIs - brilliant!