Not to take anything away from automated referral systems, but I'm still trying to get my mind around services like E-Harmony and Rhapsody that take something I like and then tell me what else I will like. Most of the time with the music services, I feel like my choices are hemming me into a small box. Often having the same suggestions made over and over annoy me to the point of wanting to shake the service in order to get a better match. (I haven't tried e-Harmony since I've been married 40 years and so far haven't needed to try it.)
So I was pleasantly surprised when Amazon made a suggestion for an author unfamiliar to me and I actually loved the book. My review for About Last Night by Ruthie Knox is on AAR today. My skepticism about electronic recommendations is lessened by this very enjoyable book.