If you like a cartographic approach to your search results, try Kartoo. I can't vouch for it's results, nor can I say I find the UI useful navigational metaphor me (that said, I do love mind mapping!). Fun to play with for a while. A weighty Flash navigator makes use of the bandwidth more & more "Web 2.x" apps assume you have.
On the subject of YASE, I would, however, suggest you take a second third look at Exalead.Then look out for Sphere, YA(Blog)SE.