Google's Mobile site (possibly the most used in the phone world?) just got itself a bump with a new 'Images' module. Search for an image now and you get a smartphone-optimised grid of thumbnails. Click on one of these and you're shown the image on its own, together with size information on the original, letting you make an informed decision on whether to load it up wirelessly. And you don't have to load the original page that contained it, either, unless you want to. A couple of screenshots below.

To try it, go to m.google.com in Web on your phone. For more information on the change, see Google's description here.