Use widescreen format for embedded YouTube links

Question

On sites where you convert a YouTube link to an embedded player (which apparently doesn't include MSO, so I can't put an example directly in this post), can you use 16:9 aspect ratio instead of 4:3? It's much more common these days. Here's an example

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How it is today

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How it could be

Answer 1

Starting with the next build, youtube embeds will be 640x385px (25px for the player), a 16:9 ratio.

This won't affect existing posts, since the conversion is done at the time of a save/edit. If you want a post to switch to the new format, simply edit it.

Answer 2

For anyone who would like this, I wrote a Grease Monkey script to fix it. You can find it over on StackApps.

Edit: That StackApps link is dead, unless you have enough rep to view deleted posts. I deleted it because there's no need for it anymore; as noted in accepted answer, they made this change in the StackExchange code.

For anyone interested in the code from a purely academic perspective, here it is:

// ==UserScript==
// @name           StackExchange embedded YouTube in 16:9
// @namespace      stackexchange
// @description    Changes YouTube videos embedded in StackExchange pages to use widescreen format.
// @include       http://stackoverflow.com/*
// @include       http://meta.stackoverflow.com/*
// @include       http://superuser.com/*
// @include       http://meta.superuser.com/*
// @include       http://serverfault.com/*
// @include       http://meta.serverfault.com/*
// @include       http://*.stackexchange.com/*
// @author         Kip Robinson - http://stackoverflow.com/users/18511/kip
// ==/UserScript==

(function() {

  function with_jquery(f) {
    var script = document.createElement("script");
    script.type = "text/javascript";
    script.textContent = "(" + f.toString() + ")(jQuery)";
    document.body.appendChild(script);
  }; 

  with_jquery(function($) {
      var attrs = {width: 640, height: 360};
      if($.browser.webkit)
        attrs.height = 390; //for some reason, embedded YouTube player uses different settings in Chrome
      $('embed[src*="youtube"],embed[src*="youtu.be"]').attr(attrs).parent().css(attrs);
    }
  );
})();