Google Image Search gets a new look, becomes even more useful
First, the new results page: it's denser with images than ever before, and you can view 1,000 images in one scrolling page before you have to jump to another one. The thumbnails in the results are larger than before, too, which gives you much better idea of what's worth clicking on. There are also new keyboard shortcuts (page up/page down) to make browsing faster.
When you do click on an image, you're no longer presented with an annoying frame at the top of your browser window. That frame was the worst thing about Google Image Search, and I am quite glad they removed it. Instead, the image appears, full size, in a lightbox above a greyed-out version of the page where it appears. If you want to view the whole page, just click outside the image.