Add class to menu link href tag? I know that using hook_menu_link I can add classes to the &lt;li&gt; tags but I need to add a class to the &lt;a&gt; tags within the &lt;li&gt; of a menu. I've looked and can't find a way. 

Any ideas?
You can do it from hook_menu_link. You want to access the $vars['element']['#localized_options']['attributes']['class']

Something like this

$element = $vars['element'];
$element['#localized_options']['attributes']['class'][] = 'your-class';
$output = l($link_text, $element['#href'], $element['#localized_options']);


Then return the $output in the &lt;li&gt;. Be sure to account for $vars['element']['#below'] if you have a sub-menu.