Feed readers, also called newsreaders and news aggregators, allow anyone to learn about the new content on their favorite websites without visiting them. Because it can minimize effort and save time, 'subscribing' to feeds can be especially useful for people who read a lot of weblogs and other websites. They also provide a great tool for websites without a regular update schedule, as visitors don't have to keep going to the site to see if it's been updated. Using a feed reader means the content comes to you, instead of you having to go to the content.

Aggregators are available in many different formats. Some are software that you download, whereas others are on the web, such as MyFeedster. Some are very simple, and others have many features; some are free, and some are not; some are made for handheld devices; some allow others to see what you're reading, etc. Some web browsers, such as Firefox, have a built in aggregator. Two good lists of aggregators are from the Google Directory and RSS Compendium.
Other choices:
Getting RSS into your Outlook:
http://www.intravnews.com/indexoffice.htm
Provides 30 days unlimited feeds and 5-10 news feeds after 30 days. Can then sign up to upgrade service.

Free Readers:
www.rssbandit.org
www.jaeger.blogmatrix.com