What joy, LINQ  to XML . This code example shows how you can use LINQ to XML to painlessly extract content from an RSS feed. No more XPathDocument and etc, coded in minutes.

        StringBuilder sb = new StringBuilder();
        //test read
        XNamespace slashNamespace = "http://www.w3.org/2005/Atom";

        XDocument rssFeed = XDocument.Load(@"http://feeds.feedburner.com/Gasta");

        var posts = from item in rssFeed.Descendants("item")
                    select new
                    {
                        Title = item.Element("title").Value,
                        Published = DateTime.Parse(item.Element("pubDate").Value),
                        Url = item.Element("link").Value,
                        Description = item.Element("description").Value
                    };

        int i = 0;
        foreach (var post in posts)
        {

            sb.Append("<a class=\"news_header\" href=\"" + post.Url + "\"><br />");
            sb.Append(post.Title);
            sb.Append("</a>");
            sb.Append("<span class=\"author\">" + post.Published + "</span>");
            sb.Append("<div class=\"description\"" + post.Description + "</div><br />");


        }

        ltr_html.Text = sb.ToString();

Want to read more, see the original article from Scott Gutherie @ http://weblogs.asp.net/scottgu/archive/2007/08/07/using-linq-to-xml-and-how-to-build-a-custom-rss-feed-reader-with-it.aspx