The most recent changes that were made to this site are listed at WebChanges. You can receive notifications whenever a change is made. You can choose between a news feed and an email alert.
If you need background information on how to set this up then read HowToUseNewsFeeds.
Email alerts
To simply sign up for email alerts, follow the instructions at WebNotify.
You will have to add a line for your subscription on the WebNotify page, like it explains in the first paragraph. The rest of the page describes the process in more detail than you need.