"Google Image Swirl organizes image search results into groups and sub-groups, based on their visual and semantic similarity and presents them in an intuitive exploratory interface. Try this tool to resolve an ambiguous query visually (apple, jaguar, beetle) or to explore a concept from different visual perspectives (Eiffel Tower, beach, impressionism)."
Below are some the results/swirls from searching "Caesar." It is nice to see Sid is right up there with Julius.
It is still in the labs, so I am sure there will be improvements when released, and I do hope they increase the size of the images in the swirls. They are a bit difficult to view. What I do like is that I can very quickly dig into subgroups of the image results, refining the search visually.
Go ahead, give it a try, Image Swirl.