Another part of the gnod website
http://www.gnooks.com/faves.php allows you to enter three of your favorite authors and after answering one question on how you like the site it will recommend some authors to you.
The best way to get usable recommendations is to pick authors that remind you of each other rather then picking three authors semi-randomly from your bookcases. My three favorite authors who write about the British Country Life gave better results than did my favorite non-fiction, science fiction and general fiction authors.