Google has launched Search by Image

Google has implemented Search by image. Now you can use web images in your searches or use photos loaded from your computer to find whatever you want, places, art, restaurants, animals and many other things.

Google Search by Image

Give it a try it at the following link images.google.com and just click the camera icon to start loading images. To search even faster, you could use the Chrome extension, here is the dowload link: chrome.google.com. After you install that extension just use right-click and you will see the Search Google with this image option.