Google has a new RSS Feed Reader in its toolbox. It has many of the features of other Feed Readers but it is Web based so you can access it from multiple computers. I use it at work and at home and that way I can track what I have read. It can also be a gadget in my personlized Google home page so I can track it along with my Google mail. I can also make readings with stars like in Google mail as well as share items with others.
You can find it at http://www.google.com/reader/