Known as "Really Simple Syndication", RSS is a way for websites to automatically broadcast information. Anyone connecting to these "RSS feeds" can get lots of different news, info and entertainment sources and read them all from one easy-to-use location. A news aggregator is the software you use to collect and read these feeds.
Recommended RSS Readers
Your mileage may vary, of course, but I've selected these two readers as quality news aggregators: Feedreader is standalone software that provides basic and simple RSS feed management. Good for those who don't want anything complex and want to keep things simple. Pluck is more complex, is visually more appealing and integrates directly with Internet Explorer. If you create a free Pluck account, can also access your feeds and favorite pages from any web browser.
Even if you could care less about these specific feeds, give them a try if you're first starting out. They'll get you comfortable with your news aggregator. Use these as a springboard to get a feel for RSS syndication, then use the RSS search tools below.
RSS Search Tools
There are many RSS search engines that catalog and maintain lists of verified feeds. If you're looking for feeds about a certain topic, use these tools.