[nopassrecover]

Wait you can barcode books into an Amazon cart!?

[gmac]

The Amazon UK iPhone app does this. Or there's RedLaser, which gives you Google Shopping results + local libraries and bookshops.

It's brilliant. Though I usually try to buy some things in the shop too, if it's a place I want to survive.

[potatolicious]

Not just barcodes, it can recognize DVD/book/CD covers too. You can even take pictures of items (iPods, laptops, toys, etc) and it will do its best to identify the item and find it on Amazon. It's pretty slick.

[WalterBright]

darn it, the ipod version of that app won't do barcodes.

[yummyfajitas]

Google Shopper for Android does this.

[tseabrooks]

Newest (US) Amazon app has bar code scanning for a product... Then add to cart.