Google Reader
http://www.google.com/reader/

Google Reader is your inbox for the web. With Google Reader, keeping up with your favorite websites is as easy as checking your email. Google Reader constantly checks your favorite news sites and blogs for new content. Use Google Reader’s built-in public page to easily share interesting items with your friends and family. Google Reader is totally free and works in most modern browsers, without any software to install. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog.