Have you used Goodreads? When you first sign up they ask you to rate books, and each time based on a book you read it shows 4 more that are related, I was VERY

Have you used Goodreads? When you first sign up they ask you to rate books, and each time based on a book you read it shows 4 more that are related, I was VERY surprised how accurate it was for some chains of books, especially when compared with Amazon. Having said that, this sounds like an awesome idea, waiting for an invite now!