This is a great company that is worth mentioning…
FeedBurner is a feed management service launched in February 2004 by co-founders Dick Costolo, Eric Lunt, Steve Olechowski and Matt Strobe.
FeedBurner is the leading provider of media distribution and audience engagement services for blogs and RSS feeds. Their Web-based tools help bloggers, podcasters and commercial publishers promote, deliver and profit from their content on the Web.
It offers advertising services for blogs and podcasts also.