Syndicating Your Weblog
Visitors to your site can subscribe to your syndicated site feed (your RSS feed) in a desktop or web-based news aggregator. This allows your visitors to automatically know when you’ve updated your site and to read your content in a variety of different applications.
An aggregator or news reader is an application (desktop, web-based, plugin) that allows you to subscribe to “feeds” of weblogs and news sites. On the Macintosh, most users prefer NetNewsWire (ranchero.com) as their desktop aggregator.
http://www.feedburner.com/fb/a/home
http://www.newsgator.com/ngs/default.aspx