Get notified when a web page changes

I am a big fan of RSS - the idea of a standard feed that can be consumed in various ways is incredibly useful. But not all websites that I would like to monitor have an RSS feed. TrackEngine to the rescue - one of several similar services available, it allows you to set a bookmark and when the web page changes, you get notified. It's very simple and effective. I bookmarked firmware download pages for various gadgets I have so that I can compulsively apply every new update as soon as it is humanly possible.