Looks like egoSurf is making all past searches part of their website content, probably in static spider-able pages. Very, very smart. Now amazingly, incredibly, their site’s content from a search engine’s point of view is growing by leaps and bounds, amazingly quickly.
Which makes egoSurf more discoverable, which increases their traffic, which …
You get the point: virtuous circle in action. And in fact, their home page is mostly exactly that: history of searches.