RSS (most commonly expanded as “Really Simple Syndication”) is a family of web feed formats used to publish frequently updated works—such as blog entries, news headlines, audio, and video—in a standardized format. An RSS document (which is called a “feed”, “web feed”, or “channel”) includes full or summarized text, plus metadata such as publishing dates and authorship.
The BBC have a really good explanation of RSS and how it can be used.
This blog publishes a RSS feed that you can subscribe too. Just look for the orange box on your browser, click on it and you should be taken to another page. Copy the link and paste it into your RSS feeder. The BBC article above has a list of readers and a Google search will also return more.
I use Google Reader and Mozilla Thunderbird. Let me know what RSS readers you prefer.