Hitachi announced a free app for the iPhone called GazoPa, that lets you search with a photo you captured on the iPhone on the web. For instance you can take a photo of a flower you do not know and search with the photo for the answer.

GazoPa is basically the Shazam for images.
GazoPa use image features such as color and/or shape, users can look for images without typing any words. This gives users easy and unique way of searching images on the web.
In addition, searching by drawing is also available on GazoPa for iPhone app.
You only need to draw what you want to search and Hitachi’s advanced similar image search technology will find images similar to your drawing. See the GazoPa iPhone app in action in the video below.

GazoPa is a Hitachi Web image search engine in private beta release, that uses features from an image to search for and identify similar images. In addition to images found using keyword searches, GazoPa enables the use of users’ own photos and drawings, and images found on the Web, as search keys to locate similar images. GazoPa can support not only photos but also the search of video thumbnails.
The GazoPa iPhone App is available for download on iTunes. More details about GazoPa can be found here.