I was going to second that; it's the first thing that came to my mind—but then it doesn't work for books without barcodes (or does it now?). I worked with versi

I was going to second that; it's the first thing that came to my mind—but then it doesn't work for books without barcodes (or does it now?). I worked with version 2 a while back, it was great. The iPhone app to scan books without the laptop nearby requires version 3 though. The Mac app could also check the price the book sells for online.