Download Amazon’s free app for the iPhone. Go to the “Remembers” section. Take a picture of any product. The picture will get uploaded to Amazon’s servers, which will try to match the image to a product in the catalog which you can then buy right then and there. I couldn’t believe it the first time I tried it. Nor the second time. It’s stellar! Doesn’t work every time, but the fact that it works at all blows me away.
I keep wondering: Why don’t they make these kinds of features more obviously available on our actual computers?