I’ve been using Shrook to efficiently keep track of the ‘blogosphere’. Check it out here. All you have to do to keep track of a new RSS feed, atom feed etc is to find the feed page for the blog and enter the URL after creating a new channel. If you use Firefox you can click the orange bubble in the URL field and this should tell you what the URL for the feed is. For example, the URL for this blog’s feed is:
Here is a screenshot of Shrook on my machine. Click on the thumbnail to get a bigger view.