WordPress.com bring the Zemanta to give you a hand full of new widgets on your edit screen that let you quickly add recommended links, photos, tags, and articles. With just a few clicks your post goes from simple to snazzy.
How to Activate Zemanta: To add Zemanta, go to Users > Personal Settings in your Dashboard. You'll see a new option near end of the page that lets you add Zemanta to your posts. Click "Help me find related content (images, links, related articles, and tags) to use in my posts." Hit "Save Changes" at the bottom of the page. You can turn it off at any time.
How It Works: Here's how Zemanta looks in your edit window. (Zemanta "Recommendations" widget is opened and dragged up next to text box.) – giving a set of recommended photos, articles, and a link to add to post.
More Info: FAQ