With a tap of your finger, Amazon's Price Check app for iPhone lets you cross-check prices against those on Amazon.com. Big time shoppers should definitely consider adding it to their download queues.
Using Price Check is as simple as it gets. Just fire it up, and point your phone's camera at the bar code of a product while you're out shopping. The app will then pull up the matching product (if available) for you to see its price on Amazon.com. If you can't access the bar code, you can also search by typing or saying the name of the product, or by snapping a picture of it (for books, CDs, DVDs, or video games). Price Check even lets you go one step further and purchase the product, if you find that Amazon's prices are cheaper.
For frequent shoppers, downloading this app is a no-brainer. It's unbelievably simple, and in our trials, each of the three search options worked beautifully.