Image Match will allow Bing users who are looking for images to click a button at the bottom with the Image Match phrase. Upon doing so, you will be presented with a number of different versions of the same picture, where there are varying sizes and resolution count for you to take note of, so that you will be able to pick the best one that is most suitable for use at that point in time.
Should you already happen to have a popular or famous image on your computer which you intend to locate a match, just upload it straight to Bing.com/Images, and fingers crossed, there will be a match as well. Better late than never to the party, eh Microsoft? [Press Release]