Automattic has released Jetpack 2.0 a WordPress plugin that supercharges your self-hosted WordPress site with the awesome cloud power of WordPress.com.
Simple, concise stats with no additional load on your server. Previously provided by WordPress.com Stats.
Email subscriptions for your blog’s posts and your post’s comments.
Social networking enabled comment system.
Monitor and manage your site’s activity with Notifications in your Toolbar and on WordPress.com.
Simple, Akismet-backed contact forms.
The WP.me URL shortener.
Hovercard popups for your commenters via Gravatar.
Easily embedded media from popular sites like YouTube, Digg, and Vimeo.
The ability to post to your blog from any email client.
Integration with and automatic posting to your favorite social networks including Twitter, Facebook, Tumblr, and LinkedIn.
For the Math geeks, a simple way to include beautiful mathematical expressions on your site.
A widget for displaying recent tweets. Previously provided by Wickett Twitter Widget
Your readers can easily share your posts via email or their favorite social networks. Previously provided by the Sharedaddy WordPress plugin.
Your writing will improve thanks to After the Deadline, an artificial intelligence based spell, style, and grammar checker. Previously provided by the After the Deadline WordPress plugin.
With Carousel active, any standard WordPress galleries you have embedded in posts or pages will launch a gorgeous full-screen photo browsing experience with comments and EXIF metadata.
A CSS editor that lets you customize your site design without modifying your theme.
A mobile theme that automatically streamlines your site for visitors on mobile devices.
Mobile push notifications for new comments via WordPress mobile apps.
The ability to allow applications to securely authenticate and access your site with your permission.
More information at Jetpack.me