FeedBurner is an RSS feed utility that provides custom RSS feeds and management tools. According to the FeedBurner site:
1. Publicize your content and make it easy for people to subscribe.
2. Optimize distribution so that your content is properly formatted for all of the major directories and can be consumed by subscribers wherever they are.
3. Analyze your traffic to learn how many subscribers you have, where they're coming from and what they like best.
Watch these ASC videos on FeedBurner: