Google announced android application called Google Shopper. This application lets you find product information quickly by using your phone's camera. It can recognize cover art of books, CDs, DVDs, and video games, along with most barcodes. You can also speak the name of the product you're looking for. It can tell price of item , places from where it can be purchased. It also saves your history so you'll always have product and price information even when you don't have a signal.
Here is demo video from google.