I've finished the rawest possible landing page to collect sign ups to get some validation. www.PublicLibrary.io, TLDR: a modern take on Goodreads, focusing on supporting local bookstores and publishers, and with a 'loan-to-your-friend' feature.
Not sure if anyone has any strong feelings about Goodreads, but I'd love to hear them, even if they are just mild feelings.
Thanks. You guys are really inspiring and keep me going after starting/killing more projects than I can name.