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Bootstrap, from Twitter

CSS Techniques for Horizontal Rules

CSS Sticky Notes

CSS Tooltips and Speech Bubbles

quplo: HTML Prototyping

Sencha Touch HTML5 Mobile App Framework

Google Chrome Extensions for web developers

Quick Grid Overlay with CSS and JQuery

When can I use... HTML5, CSS3, etc.

HTML-Ipsum

SublimeVideo HTML 5 Video Player

Brosho - Design CSS in the browser