A colleague recommended this service. I have not used it.
WatchThatPage is a service that enables you to automatically collect new information from your favorite pages on the Internet. You select which pages to monitor, and WatchThatPage will find which pages have changed, and collect all the new content for you. The new information is presented to you in an email and/or a personal web page. You can specify when the changes will be collected, so they are fresh when you want to read them. [WatchThatPage - Monitor web pages extract new information]