Do you see this symbol ever time you go to a Blog, news site, forum, etc. This is the icon that allows you to subscribe to the hosts RSS feeds. What is RSS and what are the benefits of RSS professionally and personally. There are a couple of different interpretations of this acronym, however this site gives a decent explanation. Check out Wikipedia's version.
Instead of constantly checking the latest updates on your favorite websites or bookmarking all of their sites, you can collect, organize and manage them through subscriptions in one place. As you may have read in the above links, in order to collect, organize and manage your subscriptions, you need a Reader that will aggregate these for you. There are many different ones available for free. I use Google Reader. It's easy to use and it's right in my Google account.
Now, what are the benefits?
I have over 50 RSS subscriptions that I can keep tabs on from time to time. Instead of visiting all of these websites, I go to my Reader and browse through them all for anything that looks interesting to me. The RSS Reader allows you to categorize using folders and tags. I have an easily accessable list of all of my feeds to choose from. I can organize them by date so I see the latest and greatest. I can mark posts older than a day, a week, or two weeks as "read" to clear any clutter.
Below is a video from CommonCraft that gives a simple explanation of RSS feed and a RSS reader.