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<?php
// <img ...
if ( has_post_thumbnail() ) {
  the_post_thumbnail('post-thumb'); 
} 
?>

<?php
// <a><img...> (mit link)
?>
<?php if(has_post_thumbnail()): ?>
<a href="<?php the_permalink() ?>" rel="bookmark" title="<?php printf(__('Dauerhafter Link zu %s', 'hubraum'), the_title_attribute('echo=0')); ?>">
<?php the_post_thumbnail('post-thumb'); ?>
</a>
<?php endif; ?>

<?php 
// URL only (echo)
if ( has_post_thumbnail() ) {
	the_post_thumbnail_url('post-thumb'); 
} 
?>

<?php 
// URL only (get)
if ( has_post_thumbnail() ) {
	$imageurl = get_post_thumbnail_url('post-thumb');
} 
?>