Now that FeedBurner is owned by Google, it makes sense to integrate with other Google services. One of the most requested features, a FeedFlare that shows the number of comments for each post from a Blogger blog, has been recently added. The FeedFlare links to Blogger's (ugly) comments page so you can easily add a comment if you read the post in a feed reader. Note that the comment feed has to be enabled in Blogger's settings page.
FeedBurner offers a FeedFlare API, but you need to do some server-side coding to create dynamic FeedFlares like the one that shows the comment count.{ Thanks, Pat Hawks. }