<?php
// code by seems
$category = get_the_category(); 
$name = $category[0]->cat_name;
echo "<strong>Bu kategoriye ait diger yazilar</strong>";

$postlist = get_posts('category_name='.$name.'&numberposts=40');
foreach ($postlist as $post) : ?>
<li><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></li>
<?php endforeach; ?>
<br />
  <center><?php previous_post('&laquo; &laquo; %', '', 'yes'); ?> |&nbsp; <?php next_post('% &raquo; &raquo; ', '', 'yes'); ?></center>