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Reverse image search: pure awesomeness
See the little camera icon to the left of the seach button in the image above? Go to the Google Images home page and click that button. What you will see is a menu that asks you either for a URL or to upload an image. So, what good does that do you? Well, have you ever seen a tiny picture that you wanted to see full-size? Simply save that image or copy the URL to it, follow the prompt after you click that camera icon, then revel in the joy that is reverse image search!
That is just one of the many applications reverse image search is good for. Check out this post of mine, as well as the Google video below, for additional clarity and uses of reverse image search: