Google Shows New Services in Battle of Search Engines - New York Times: "Google's new efforts are an answer to Yahoo, its main search rival, which has tried to differentiate its products by adding social features. MyWeb from Yahoo, for example, allows users to identify and label interesting Web pages and share them with their friends.
On Wednesday, Google introduced a beta, or test service, called Google Co-op. Eventually it will allow Google users to mark Web pages they like and associate each page with certain topics. For now the service is mainly of use to large organizations, which can mark their own sites with labels and submit them to Google to make relevant information easier to find in search results. "