My Loop ain't Runnin!

Can anybody shed some light on my Loop… the second part posts the permalink of the page instead of the remaining posts in the category…. I must be doing something wrong.

<div id="main-content-werk">

        <div id="slider">
          <?php $my_query = new WP_Query('category_name=werk&posts_per_page=3');
           while ($my_query->have_posts()) : $my_query->the_post();
           $do_not_duplicate = $post->ID;?>
           <a href="<?php the_permalink() ?>" title="<?php the_title(); ?>"><img src="<?php echo get_post_meta($post->ID, 'slider-image', true); ?>" alt="" title="<?php the_title(); ?>" /></a>
           <?php endwhile; ?>
         </div> <!-- END slider -->

         <br clear="all" />

        <?php if (have_posts()) : while (have_posts()) : the_post();
        if( $post->ID == $do_not_duplicate ) continue; ?>
          <a href="<?php the_permalink() ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a>

        <!-- Do stuff... -->

        <?php endwhile; endif; ?>

    </div> <!-- end main-content-werk -->