Looking for Book Database App

I am looking for a book database app to keep track of my physical books. I have used a Windows based application called BookBag plus but it looks like there won't be an iPhone version. I'm looking for an app that offers barcode scanning and a database that will work on my iPhone, iPad and PC (via the web) at the same time. I've looked at iBookshelf and Book Crawler and they seem OK but they don't seem to work on multiple devices. From what I can tell I will be able to transfer my existing database via a CSV file.

Any recommendations will be appreciated.

Thanks,

Mike