Being that Simple HTML Dom is a class you would normally create a library fot it, but in this case it fits perfect as a helper. let me show you.

class Welcome extends Controller
{

	function __construct()
	{
		parent::Controller();
		$this->load->helper('dom');
	}

	public function index()
	{
		// Grab HTML From the URL
		$html = file_get_html('http://codeigniter.com/');

		// find all link on Codeigniter Site
		foreach($html->find('a') as $e)
    	echo $e->href . '<br>';
	}
}

Produces a list like this:

You cant get it much easier.

On the simple dom web site they give you good examples on how to use the parser and within the download they also give extended examples.

You can either download files from there site or download the ci dom helper and a copy of their files here .

Happy Scrapping.