Glad you like it! :) Were you able to sign up? I just looked back at my old comment and saw that I forgot to add a hyperlink (my mistake!). Sorry about that if it caused any trouble!
I am actually working on something like that right now, a place for book readers to discuss the books they have read, are reading, and/or are interested reading. My goal is for it to be a great place for discourse on books and a great place to find new books. I'll be launching my MVP within the next month.
Current site is discorse.co
I currently have over 100 people signed up and would definitely love if HN users signed up and gave feedback. :)