A possible retreat from goodreads ... though I'm tempted to yell "get off my lawn" at this site's tumblresque-ness. Yes, that's totally a word.
I just noticed the awesome bookmarklet (this could've been there all along, but it just now stuck out to me.)
Go to: http://booklikes.com/shelf and above your shelves in Shelf View you'll see a Shelve It! button at the top left. Click on it and drag it to your toolbar and then you can add books straight from an Amazon or Book Depository page.
(Totally didn't plan the Sailor Moon shelf ... but the covers are so pretty!)
I like to add my specific version that I own, so this is going to be super helpful.