Grokker is a search tool that organizes results in a logical, zoom-able visual interface. By visually arranging data it's great for topic searches because it displays results with contextual relevancy. Trying to explain it is kind of silly-- just go download the trial and see for yourself. It's the best visualization experience I've had since Newsmap. UPDATE: I had to uninstall this thing because it was creating a suspicious amount of network connections to its home server, even when the app wasn't running. Too bad because it's a great visualization.