Index: wp-includes/post-thumbnail-template.php
===================================================================
--- wp-includes/post-thumbnail-template.php	(revision 15432)
+++ wp-includes/post-thumbnail-template.php	(working copy)
@@ -73,4 +73,25 @@
 	return apply_filters( 'post_thumbnail_html', $html, $post_id, $post_thumbnail_id, $size, $attr );
 }
 
+/**
+ * Retrieve Post Thumbnail Data.
+ *
+ *
+ * @param int $post_id Optional. Post ID.
+ * @param string $size Optional. Image size.  Defaults to 'thumbnail'.
+ * @param bool $icon Optional, default is false. Whether it is an icon.
+ */
+function get_the_post_thumbnail_src( $post_id = NULL, $size = 'post-thumbnail', $icon = false ) {
+	global $id;
+	$post_id = ( NULL === $post_id ) ? $id : $post_id;
+	$post_thumbnail_id = get_post_thumbnail_id( $post_id );
+	$size = apply_filters( 'post_thumbnail_size', $size );
+	if ( $post_thumbnail_id ) {
+		list($src) = wp_get_attachment_image_src( $post_thumbnail_id, $size, $icon );
+	} else {
+		$src = false;	
+	}
+	return apply_filters( 'post_thumbnail_src', $src, $post_id, $post_thumbnail_id, $size, $icon );
+}
+
 ?>
\ No newline at end of file