I have spoken before about Tineye which allows you to identify unknown images either by uploading the image or pasting in the url to find it. Well now you can also do it using a Google search. Simply go to the "image" line at the top of the search page and then hit the camera icon and enter in the url or upload the picture. You can even use images that are NOT on the Internet. Above is a short video showing how both are done. I found the information on Google at Mindshift.