The Google Webmaster Tools previously known as Google Sitemaps has gone through some changes and also revamped it’s interface.
The screenshot below shows, Webmaster Tools now displays how many “Google Subscribers” your feeds have. From the Subscriber Stats page, which can be found under Statistics in the menu:
If your site publishes feeds of its content, this page will display the number of users who have subscribed to these feeds using Google products such as iGoogle, Google Reader, or Orkut. Because readers can use other sites and aggregators to subscribe to your content, your total number of subscribers from all sources may be higher. Also, these stats list only those feeds with actual subscribers. If your site publishes a feed that does not currently have any Google subscribers, it will not be listed.Google, Google Webmaster Tools, Web Analytics, Google Sitemaps, Feed, RSS, Feed Subscriber, New Features, Featured News
Source:→ Google Blogoscoped