Yeah, books might be a good niche for a product like this. There is a market for software targeting people selling through Amazon who really need just inventory

Yeah, books might be a good niche for a product like this. There is a market for software targeting people selling through Amazon who really need just inventory management and not customer lists and the other features mentioned in the original article. The custom barcode scan stuff is spot on, it would be interesting to have a Android or iPhone application that integrates potentially in real-time with a web app (look at the Roller demo that Google just released to see how simple integration can be) and is used as a barcode scanner. Supporting ISBN, QR, other custom barcode formats could be a valuable feature.