JS-Kit's ECHO is a service that can be embedded in CMS as a replacement for commenting, and provides a real-time stream of diggs, tweets, comments. The interface, at first blush, looks a bit like an email composition form, with From, To, and Body Fields. Selecting the From drop down menu shows options for logging in your identity via JS-Kit or a third party social networking API. The To: field adds "This Page" by default, meaning you're adding a comment to this page. It also allows you to enter other destinations, e.g. Twitter, FaceBook, FriendFeed, to alert your contacts in those social networks of your comment.