An image recognition API that seems to be able to magically recognise the items in any image with a surprising degree of accuracy. CloudSight is a simple web API. You can send an HTTP request with your image and it'll start analysing the image to find recognisable objects in a way similar to Google Goggles. When the processing is complete you'll be able to request a description of the image's contents. Plans are quite expensive but if you have an app that could make use of image recognition CloudSight is worth taking a look at.