I came across this neat little plug-in last night.   What it does is take all the images on the page, and puts them into a fly-by-wall type preview allowing you to pan through the images, select and enlarge the image you want.  A few sites like google images, facebook, myspace, flickr and deviantart are already compatable with this plug-in, so I can presume it isn't hard to add the necessary markup to make it work on any site.

You can see a quick example below I made searching for Italy on google images (click for larger picture):

The plug-in is made by cooliris, is around 1Mb to download and you can find more info and a demo here.