So I just found this really awesome site for big time readers, YourNextRead. How it works is you enter in the title of a book you have read and it will give you recommendations for other books to read. I would think this would be very valuable recommendations for people who fly through books like my wife. She will finish a book and then have to scour the Kindle store for a new book to read. You should check it out. Here's what the site looks like, but please ignore the nerdy book I am currently reading haha.