FeedBurner's FeedFlare Services allows feed publishers to add content to the bottom of their syndicated post with more information about their content. It gives your subscribers an easy way to email, tag, share, and act on the content you publish.
FeedFlare places a simple footer at the bottom of each content item, helping you to distribute, inform and create a community around your content. This really is where Feed Optimisation meets Web 2.0
To see FeedFlare in action check out My Feed.