<p>Does <code>YUI</code> have selector methods like jQuery?</p>

<p>e.g. get me all div's that are <code>children</code> of <code>&lt;table&gt;</code> that have links in them?</p>

Check the
YUI Selector Utility
, it gives you
CSS3
selector sintax, it still in beta but works quite well, check this example:
YAHOO.util.Selector.query