A long, long, long time coming, Google is finally testing a page preview feature that shows snapshots of the pages on the search results before you click through. Yes, many search engines have had this feature for a while and yes, there are plugins that added this feature to Google - but Google never really had such a feature, until now.
As I reported yesterday on Search Engine Land via Google Operating System blog, the way to access this feature is to search on something and click on "show options," you can then look towards the button on the left hand side and click on "page previews," and walla!
Forum discussion at WebmasterWorld.