I have to say, why such loud mouseover effects? It's distracting to have all these boxes popping in and out as I scroll through the results. I get that you're trying to show that the click area is that big, but it impairs readability--most of the time while using a search engine I am reading very quickly. Perhaps some people leave their mouse off to the side when they scroll, but many people "think with their mouse," pointing at stuff as they look at it.

I would personally tone them down to just the underline appearing on the result link (where that activates for the big click area, and not just when mousing over the link within the big click area).