It would be great if I could scan EAN-code from a book and mbarcode would add this book to my google books bookshelf. Or query my bookshelf and inform me if I already have this book. Would anyone like to write this kind of plugin for mbarcode? Google offers API for it. http://code.google.com/apis/books/docs/gdata/developers_guide_protocol.html#SharingWithMyLibrar y