Android Scan is an Android application that finds pricing and metadata for
anything with a barcode. This is one of the most useful mobile application. Check out the 3-minute video showing it in
action with real barcodes:

http://scan.jsharkey.org/

Here are some key features that make Scan stand out:

• Automatic barcode recognition using phone camera
• Shows CD, DVD, or book cover along with detailed reviews
• Searches over a dozen stores, both online and brick+mortar
• Tracklisting for CDs and play sample tracks right on phone
• For books, searches local libraries to see if they have a copy

Here is the video on how this android scan works