Specto for Linux and WebMon for Windows. Two tools that will "watch" a website looking for changes. Sometimes RSS feeds don't exist (or get updated), sometimes you just want to know when something has gone live, or you'd like to know if someone came in and messed with your page. For whatever reason you can use a tool like this to keep an eye on things. It should be noted that Specto is considered abandon-ware, the author has stated that it's dead to him and will not be worked on anymore, but if the program works there's no reason for it to be updated...