A.php

<?php
# app/Modules/Events/views/indexAction.html.php
?>
	<div class="section recent-tags">
		<h3>
			Recent Tags
			<span class="f-right"><a href="<?php echo $this->kernel->url('module', array('module' => 'Tags')); ?>" title="view more tags">View All</span>
		</h3>
		<?php
		// Get tag cloud from Tags module
		echo $this->kernel->dispatch('Tags', 'tagCloud', array('conference'));
		?>
		<div class="clear"></div>
	</div>

B.php

<?php
# app/Modules/Tags/Controller.php
class Module_Tags_Controller extends Alloy_Module_Controller
{
// (snip) ...
	/**
	 * Genereate a tag cloud from tags
	 */
	public function tagCloud($tagType = 'conference')
	{
		// Fetch upcoming conferences tags
		$mapper = $this->mapper();
		$tags = $mapper->getRecentTagsByType($tagType);
		
		// Return view
		return $this->view(__FUNCTION__)
			->set(array(
					'tags' => $tags,
				));
	}
}

C.php

<?php
# app/Modules/Tags/views/tagCloud.html.php
?>
<ul class="tag-cloud">
<?php
// Get tags in array of 'name' => 'frequency'
$tags = $this->tags->toArray('name', 'frequency');
if($tags) {
	$tagFrequencyMax = max(array_values($tags));
	$tagFrequencyMin = min(array_values($tags));
	$tagHighlightMin = $tagFrequencyMax / 2;
	ksort($tags); // Sort alphabetically by tag name
}
$i = 0;
foreach($tags as $tagName => $tagFrequency):
?>
	<li class="<?= ($i++ % 2 === 0) ? 'odd' : 'even' ?><?php echo ($tagFrequency > $tagHighlightMin ? ' tag-highlight' : ''); ?>">
		<span class="tag">
			<a href="<?php echo $this->kernel->url('module', array('module' => 'Events'), array('tag' => $tagName)); ?>">
				<?php echo $tagName; ?>
			</a>
		</span>
	</li>
<?php endforeach; ?>
</ul>