Quite a few already. Taking it as a good sign. I'm a little stuck on what to use to ensure uniqueness. Members might submit different editions of the same book, so title alone probably wouldn't suffice as a constraint. The homepage, perhaps?

I also accidentally submitted a dupe (sorry). You also need a search function.

Looks great though, and nice idea.

I submitted a dupe and wanted to remove it but couldn't find that option.