cd app/Plugin
git clone git://github.com/aschelch/cakephp-notification-plugin.git Notification

public User extends AppModel{
	$actsAs = array(
		'Notification.Notifiable' => array(
			'subjects' => array('User', 'Post', 'Comment')
		)
	);
}

$this->User->notify(1, 'post_comment', array('User'=>2,'Post'=>456,'Comment'=>123));

<a href="<?php echo $this->Html->url(array('controller'=>'post','action'=>'view',$data['Post']['id'])) ?>">
	<?php echo __("%s comment your post %s", '<strong>'.$data['User']['username'].'</strong>', '<strong>'.$data['Post']['title'].'</strong>'); ?><br/>
	<small><?php echo $this->Time->niceShort($data['Notification']['created']); ?></small>
</a>

<ul class="nav pull-right">
	<?php $notifications = ClassRegistry::init('User')->getUnreadNotification(AuthComponent::user('id')); ?>
	<li class="dropdown">
		<a href="#" class="dropdown-toggle" data-toggle="dropdown">
			<?php echo __('Notifications') ?>
			<?php if (!empty($notifications)): ?>
				<span class="badge badge-success">
					<?php echo count($notifications); ?>
				</span>
			<?php endif ?>
		</a>
		<ul class="dropdown-menu">
			<?php foreach ($notifications as $notification): ?>
				<li><?php echo $this->Notification->display($notification); ?></li>
				<li class="divider"></li>
			<?php endforeach ?>
			<li class="text-center"><?= $this->Html->link(__('Display all'), '#'); ?></li>
		</ul>
	</li>
</ul>