<?php
query_posts(array(
'post_type' => 'portfolio',
'showposts' => 10
) );
?>
<?php while (have_posts()) : the_post(); ?>
<h2><a href="<?php the_permalink() ?>"><?php the_title(); ?></a></h2>
<p><?php echo get_the_excerpt(); ?></p>
<?php endwhile;?>