I really like this app, Snaptell on my iPhone (it also works on Android).
It recognized my school math textbook and showed me prices to buy it. I also enabled it to send me a copy to my e-mail.
The app recognizes “books, DVDs, CDs, and video games sold in the US”. They state they will cover international products at some point too.
Free iPhone App
It’s free.
Tags: android, App, free, iphone, recognition