The Mozilla Foundation's Labs has launched The Coop, a project that will let people keep track of their friend's online activities. The add-on will create a row or column of friends' photos. When a photo glows, the user can see that a friends has a new link, photo, blog, or video to share from content-sharing services such as del.icio.us and Flickr. The project planners envision using RSS or another mechanism to move the data between people's browsers. For more information, check out this News.com article.