Tracking Web Page Changes. It is difficult enough tracking down relevant and useful sites, but keeping up with changes to the pages is an impossible task when you have more than a dozen or so to monitor.
Link checkers such as Xenu Link Sleuth ( can alert you to pages that have disappeared or that are redirecting users to another site, but changes to the content are equally if not more important. There are many services that track web page content for changes. ChangeDetect - Web Page Monitoring - Free Online Service. Track and monitor web page changes and receive notifications. ChangeDetection - Know when any web page changes. Logiciel de Surveillance de pages Web.