Just Updated for November: Find Out How Many People Use 1,000 of Your Favorite Social Networks, Apps and Digital Services
The key features of the new extension are notifications for new blog likes and follows and the ability to quickly create a new post from your browser. The latter is very handy when you come across a web page that you would like to write a new post about.
Unfortunately, this new extension only works for WordPress.com-hosted sites. Owners of WordPress blogs (like this one) that are self-hosted are out of luck for now.