Summary. WordPress JetPack 2.0 offers the following enhancements.
- Publicize: Connect your site to popular social networks and automatically share new posts with your friends.
- Post By Email: Publish posts to your blog directly from your personal email account.
- Photon: Images served through the global WordPress.com cloud.
- Infinite Scroll: Better/faster browsing by pulling the next set of posts into view automatically when the reader approaches the bottom of the page.
- Open Graph: Provides more detailed information about your posts to social networks.
- JSON API: New parameters for creating and viewing posts.
- Compatible: Improved compatibility for the upcoming WordPress 3.5.