Jetpack has been updated to version 1.2.1 from our previous version of 1.1. Notable functionality added is the ability to add site subscriptions which allows users to sign up to receive notifications of new posts. Additional widgets and search engine submission features are also included.
Learn more at jetpack.me
How to Activate
Jetpack is not activated as part of a standard blog package, but is included as a plugin you can manually activate. Go to “Plugins” and then “Installed Plugins” and then activate “Jetpack.” Note that you will need a WordPress.com user account to activate Jetpack.