Here's some ways you can follow and find out when there's new content!
An RSS Feed is a collection of simplified versions of the content on a site (usually just text and an image, so no fun interactive stuff), published so that Feed Readers can follow a site's updates without going to the site itself. People generally use feed readers to keep up with a variety of pages so they don't need to remember to check them.
More on RSS Feeds on Wikipedia.
If you need another kind of feed, here's RSS1.0, ATOM, and RDF