Bing has introduced a very nice image feature which allows you to find different sizes of the same image. Find an image you want, mouseover it and chose the 'Find more sizes' option. You'll then get a page of results a little like this:
You can then simply mouseover each title to see the image, and you've already got source, resolution, file size and type on the screen already. Great if you're looking for a particular image and don't want to have the hassle of trying to resize it. Also interesting to see if there are any copyright violations as well I should think! Nice bit of functionality. Well done Bing!