To scan a barcode, you just hold the iPhone so that the barcode appears in a highlighted window and as soon as the image is steady enough, the app automatically takes a picture, compares it to its database, and renders your results. Another way of getting information into the app is typing in the numbers of the barcode into an oversized numeric keyboard.
I had it scan the CD of Tommy and it came back with a picture of the album cover, a prices line showing the lowest to highest found price which when tapped upon, showed the underlying five vendors, another tap gets you to the selected vendor's site to buy it. You can also choose a tab to get to Google for a standard search and another for Amazon where you can log-in and put it on your wish list or purchase the item. The vendors in the low to high price list never included Amazon, which I thought odd since Amazon was a persistent button on each search.
You can check If the item is found on iTunes. If so, you are presented with a contextual service option which brings in iTunes information. Instead of giving me one entry for the album of Tommy, it gave me many instances that contained the word Tommy.
Results are saved to lists. The Recent list shows the last thing you searched for, the History list shows everything you've searched for. You can create custom lists and easily move any searches between lists. Results can also be shared allowing you to email the search.
So, is it any good? Read on...