I have recently been tasked with following a number of blogs more closely for work.  As part of the process, I went out and reviewed the options for RSS readers for Windows.  The package that I came across and have started using is called FeedDemon.  This is a very full featured free application.  One of the coolest features is the ability to specify keywords in a watch list.  FeedDemon will search all posts that come through for those keywords and post them.  This is particularly useful if you have specific content that you want to track.  In my case, I included numerous keywords related to topics that I wanted to focus on.  The entire process was seamless.

The other thing that FeedDemon does is synchronize witht he Newsgator site to allow you to read your feeds on the web.  Thus you get the best of both worlds, a powerful client side app and a web app for when you don't have access to your computer.  I would highly recommend this program to anyone interested.