FeedBurner was acquired by google

FeedBurner was a pay services previously, now it will be free:

FeedBurner PRO
FeedBurner is a Chicago-based company, a News feed management provider launched in 2004. Its Web-based tools, provides custom RSS feeds and management tools to blog advertising network, web-based content publishers, podcaster to help promote, deliver, and monetize their content on the Web and make feed-based content more accessible and manageable for its end users.