If you're new to this whole newsreader-RSS feed business, read this article from J.D. Lasica to learn more about why having a newsreader can greatly improve your research efforts.
Once you are ready to dive into the very deep pool of RSS feeds, Blogstreet stands ready to help with its RSS Discovery Directory. The directory contains over 11,000 RSS feeds -- you can browse the directory or enter the name of your favorite website to see if an RSS feed exists for that site. (Via beSpacific)