Interesting libraries:

<ul>
<li><a href="http://www.reddit.com/r/programming/comments/ib5zn/paperjs_the_swiss_army_knife_of_vector_graphics/">paper.js</a> &mdash; a layer on top of HTML5's canvas
<li><a href="http://html5boilerplate.com/">html5boilerplate</a> &mdash; get HTML5 features, even in IE6
<li><i><a href="http://code.google.com/apis/libraries/devguide.html#Libraries">list @Google CDN</a></i>
<li>MVC libraries
    <ul>
    <li>backbone.js
    <li>knockout.js
    </ul>
</ul>