From the Google Code Blog --
"If you’ve used Google Search recently, you may have noticed a new feature that we’re calling Instant Previews. By clicking on the (sprited) magnifying glass icon next to a search result you see a preview of that page, often with the relevant content highlighted. Once activated, you can mouse over the rest of the results and quickly (instantly!) see previews of those search results, too."Click to try it! Click to read more
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