loop in posts with same taxonomy term

<?php
	//for in the loop, display all "content", regardless of post_type,
	//that have the same custom taxonomy (e.g. genre) terms as the current post
	$backup = $post;  // backup the current object
	$found_none = '';
	$taxonomy = 'kund';//  e.g. post_tag, category, custom taxonomy
	$param_type = 'kund'; //  e.g. tag__in, category__in, but genre__in will NOT work
	$post_types = get_post_types( array('public' => true), 'names' );
	$tax_args=array('orderby' => 'none');
	$tags = wp_get_post_terms( $post->ID , $taxonomy, $tax_args);
	if ($tags) {
	  foreach ($tags as $tag) {
	    $args=array(
	      "$param_type" => $tag->slug,
	      'post__not_in' => array($post->ID),
	      'post_type' => $post_types,
	      'showposts'=>-1,
	      'caller_get_posts'=>1
    );
    $my_query = null;
    $my_query = new WP_Query($args);
    if( $my_query->have_posts() ) {
      while ($my_query->have_posts()) : $my_query->the_post(); ?>


	my divs and stuff...

		<?php $found_none = '';
    	endwhile;
	    }
	  }
	}
	if ($found_none) {
	echo $found_none;
	}
	$post = $backup;  // copy it back
	wp_reset_query(); // to use the original query again
	?>
	</div> <!-- end thumbnail area -->