Today, a Google Chrome browser extension "FastestChrome" caused false alarm, that Google might be testing "Infinite Scroll" in the search results.
"Matt Beck, emailed a video of Google testing a form of infinite scroll in the search results. Infinite scroll is when you don't have to click the next page button on the search results to see additional search results. Instead, scrolling down will automatically load more search results."
Here's the image and the video from Matt Beck: