RSS (Really Simple Syndication) allows you to see when certain pages on TunAtheDay.com have been updated. You can get the information as soon as a new page has been published, without having to remember to visit each site every day. They are, in fact, just a special kind of web page designed to be read by computers rather than people.
There are a number of pages on TunAtheDay.com that have an RSS version :
You will need a modern browser such as Firefox or Safari or a standalone News Reader or visit netvibes.com to find an online RSS reader. To find a good standalone newsreader for your computer, try visiting Version Tracker and searching for 'RSS reader' for Windows or Mac OS.