I need to be notified when a website (that doesn't use rss) gets updated. something that will parse the html a few times a day and compare it to a previous parse and will notify me when there is a change. content added or content removed, I don't want it to keep track of a hit counter though. does anyone know of a FF extension or some wacky open java app? any other ideas of keeping track of website content that doesn't have rss or any other feeds? i need to be able to track about 500 websites a day.