In WP there are now the backlinks plugin . For the display, you can activate a widget or the following "pure coden hard" in the sidebar.php of your theme: 

  <Php if (function_exists ('backlinks')) backlinks ();?>

If you do not use the default folder for Wordpress (as here indicated), then one should modify the following line in backlinks.php: 

  $ Feed-> set_cache_location ($ _SERVER ['DOCUMENT_ROOT'] 
  .  '/ Wp-content/plugins/backlinks/cache');

in 

  $ Feed-> set_cache_location (dirname (__FILE__), '/ cache'.)

thus, no error message appears a la: 

  Warning:. / Cache / is not writeable in filename.spc 
  . / Simplepie.inc on line 1769