Recently Google updated their Webmaster Tools account with more data and a revamped Interface. Personally I find the new interface to be much easier to use.
The biggest addition is a web site feed subscriber stats section. You can see the subscriber stats from the Statistics tab.
The all new subscriber stats give you details about how many people subscribe to your web site feeds, such as RSS and atom feeds, through Google services. Although this won’t give you the total number of subscribers since not everyone is using Google tools to subscribe to your feeds, it does provide a nice overview and a gauge at how popular your feed actually is.
If you are unsure what a feed actually is, or you are interested in learning how to get more subscribers to your feeds through Google, there is a Google help page describing how to set up and track site feeds
If you don’t yet have a RAGE Google Sitemap Automator. XML Sitemaps help you get your web site indexed faster and more thoroughly, giving you much more control on how search engines find and index your web site.