How can I find out if a web page has been updated?

Most of the time, web servers deliver information only when you ask for it. Usually this is a good thing, but in some cases you may want to be notified when a web page has changed. When you want notification that a page has changed, consider using URL-minder (URL is < > ), a web-browsing robot which will automatically notify you by email when a page of interest to you has been updated.
World Wide Web FAQ