This container, when combined with a Placeholder Definition will cause the referenced block to never be cached.

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/**
 * Yourcompany.com
 *
 * PHP Version 5
 *
 * @category  Namespace
 * @package   Namespace_Module
 * @author    Your Name <your.name@yourcompany.com>
 * @copyright 2012 yourcompany.com
 * @license   http://www.yourcompany.com/license.txt Your license
 * @link      N/A
 */

/**
 * Cache container
 *
 * @category Namespace
 * @package  Namespace_Module
 * @author   Your Name <your.name@yourcompany.com>
 * @license  http://www.yourcompany.com/license.txt Your license
 * @link     N/A
 */
class Namespace_Module_Model_Pagecache_Container
    extends Enterprise_PageCache_Model_Container_Abstract
{
    /**
     * Get container individual cache id
     *
     * Override to return false to cause the block to never get cached
     *
     * @return string
     */
    protected function _getCacheId()
    {
        return false;
    }

    /**
     * Render block content
     *
     * @return string
     */
    protected function _renderBlock()
    {
        $block = $this->_placeholder->getAttribute('block');
        $block = new $block;

        // only needed if the block uses a template
        $block->setTemplate($this->_placeholder->getAttribute('template'));

        return $block->toHtml();
    }

    /**
     * Generate placeholder content before application was initialized and
     * apply to page content if possible
     *
     * Override to enforce calling {@see _renderBlock()}
     *
     * @param string &$content The content
     *
     * @return bool
     */
    public function applyWithoutApp(&$content)
    {
        return false;
    }
}