I love Jetpack, they have very good services and I think they did a phenomenal job! Today I am using their new services post it via email and automatically publish, in Facebook and Twiiter.
If you are a WordPress lover then, you should have probably used this plugin. if not then please go ahead and install it.
WordPress Plugin URL:
http://wordpress.org/extend/plugins/jetpack/
Developer Site:
I will write a full review on each aspects of this plugin soon.