Amazon app just became incredibly useful!
You can just scan a barcode of any item and Amazon app instantly scans its entire catalog. Yes, it’s entire catalog and we how big that is!
This feature is available only to iPhone 4 and iPhone 3GS running on iOS 4.
There are many awesome barcode scanner apps around like RedLaser iPhone app but I use Amazon way more often and it is handy to have a scanner right there. Especially while walking around stores wondering if Amazon has it for a lower price.

Amazon Remembers
Also, there is an experimental feature in the Amazon mobile app and I am not sure how long this has been in it although I found a picture I took back in December.
With Amazon Remembers, you can take a picture of an item in your possession and send it to Amazon. Amazon will compare the product with all their product images and try to come up with a match. This is done with automated recognition software as well as real people.
As this Lifehacker post points out, this could be used to create a quick home inventory of items we own. And that could come in very handy in times of insurance claims.

As Amazon identifies the items you throw at it, it also adds a nice link to items you can replace it with including the cost.

