When 'Google Instant Previews' was rolled out last year, there were mixed set of positive & negative reactions about it.

Today, it looks a bit redesigned.

Now besides the normal list of search results, you can see an arrow and by clicking on the magnifying glass and you get a full page preview on the right side of the page..

This makes it pretty easy to assess whether the site you are looking at is relevant before you waste time loading up the page full screen.

There is also a orange outlined & highlighted area to emphasize the area of the page that contains information relevant to your search criteria.