Clusty organizes results into an outline.
Clusty also clumps results, but it does so in a more traditional format: an expandable, outline-like list of subtopics to the left of your results. It’s less weird, and less fun, but just as useful as Quintura. It’s probably better suited to people with very organized minds. Outliner fans will like it.
Clusty also has a Wii-friendly version, which is a neat trick.