Link: A Review of Web Site Change Detection Services. The always useful Marshall Kirkpatrick has done a short review of some of the Change Page detection services. He looked at Watch That Page, ChangeDetection, ChangeNotes and TrackEngine. In his conclusion he says that he'd use TrackEngine, but ChangeNotes and WatchThatPage are also good. What he really wants is a resource that checks pages hourly, rather than daily. What I'd like is a Firefox extension that will do this for all the bookmarked pages that I've got - anyone know if there is one?