Released on Jun 15 2007 with lots of improvements, the new RSSToolkit by Microsft is a great facility to consume and publish the Atom/OPML/RDF feeds.
Checkout the following URLs to findout more.
http://blogs.msdn.com/shahpiyush/archive/2007/06/16/3331941.aspx
http://weblogs.asp.net/scottgu/archive/2006/02/22/Awesome-ASP.NET-2.0-RSS-Tool_2D00_Kit-Released.aspx