I stumbled onto the google test list tonight and noticed a new preview feature in search. It works really well and takes good advantage of the excess white space on their search page. A nice bonus is the non forced nature of it. If you mouse over any of the results nothing happens unless you click on one of the magnifying glasses. The full length preview of the page immediately comes up (way quicker than I have ever seen on other search engines) and since its the full page scrolled you can read and browse it quite thoroughly. After the first magnifying glass is selected, subsequent search results show the preview by simply putting the mouse over it. Also if you scroll the preview does not flicker through mouse over events so you can browse the full preview. When you stop scrolling and mouse over a new result it then switches. Overall feel was great and I hope they roll this out.