Add YUI Theater to Learning Resources.

It ain't just about YUI!

index.html

@@ -91,6 +91,7 @@ <h2 id="other_learning_resources" class="subhed">Other learning resources</h2>
                 <li><a href="http://paulirish.com">Paul Irish&#8217;s blog</a> - all about helping you build cool websites and keeping you up to date on the latest news.</li>
                 <li><a href="http://dev.opera.com">Dev.Opera</a> - Articles for learning about HTML5 features.</li>
                 <li><a href="http://paulirish.com/2011/web-browser-frontend-and-standards-feeds-to-follow/">Web browser, frontend and standards feeds to follow</a> </li>
+                <li><a href="http://yuilibrary.com/theater/">YUI Theater</a> - Videos of talks about frontend engineering and web technologies given at Yahoo! over the years (many of them unrelated to YUI).</li>
               </ul>
 
               <h2 id="reference_docs_wikis" class="subhed">Reference docs/wikis</h2>