Another Douglas Crockford video. This time Douglas talks about the Document Object Model, about how Java failed, and JavaScript evolved thanks to DHTML and DOM. He talks about how to use DOM to traversing and manipulating elements in an HTML document, walking the DOM, making elements, innerHTML, as well as Events, memory leaks. He talks about the cracks in DOM, and how we must be prepared to back off when we hit the browser limits of DOM.
Christian Heilmann does a tree menu without using loops. It demonstrates the flexibility and power of Event delegation - catching events at a higher level in the document. It drastically cuts down on the number of events you need to add to a document. One event handler per menu, rather than one per link in the menu.