Very small amount of code required to create a RSS feed in Umbraco.

Rss.cshtml

@inherits Umbraco.Web.Mvc.UmbracoTemplatePage
@using Bjerner.Website.Web
@{
    Layout = null;
    RssFeed feed = new RssFeed {
        Title = "Bjerner.dk Blog",
        Link = "http://blog.bjerner.dk/",
        PubDate = DateTime.Now,
    };
    foreach (IPublishedContent child in Model.Content.Children.OrderByDescending(x => x.CreateDate).Take(20)) {
        feed.Add(new RssItem {
            Title = child.Name,
            Guid = child.Id.ToString(),
            PubDate = child.CreateDate,
            Link = child.UrlWithDomain()
        });
    }
    feed.Write();
}

Very nice. Of course it is the RssFeed and RssItem classes buried in Bjerner.Website.Web that do all the work. Are you sharing those too?

Sure. You can find it here: https://gist.github.com/abjerner/9543768