A basic implementation of an Umbraco SurfaceController that returns RSS feeds

SyndicationController.cs

using System;
using System.Linq;
using System.ServiceModel.Syndication;
using System.Web.Mvc;

using JamesDibble.ApplicationFramework.Web.Rss;

using Umbraco.Web;
using Umbraco.Web.Mvc;

public class SyndicationController : SurfaceController
{
    public ActionResult RssFeed()
    {
        var feed = BuildFeed();

        return this.RssResult(feed);
    }

    public ActionResult AtomFeed()
    {
        var feed = BuildFeed();

        return this.AtomResult(feed);
    }

    private SyndicationFeed BuildFeed()
    {
        var feedItems = this.Umbraco.TypedContent(/* ID of the root content node */).Children;

        var items = blogs.Select(this.CreateItem).OrderByDescending(i => i.PublishDate);

        var feed = new SyndicationFeed(
            "Feed Name",
            "Feed Description",
            new Uri("http://mywebsite.com/feed"),
            items)
        {
            Language = "en-gb",
            LastUpdatedTime = DateTime.Now
        };

        return feed;
    }
    
    private SyndicationItem CreateItem(IPublishedContent item)
    {
        var syndicationItem = new SyndicationItem
        {
            Title = SyndicationContent.CreatePlaintextContent(item.GetPropertyValue<string>("title")),
            Summary = SyndicationContent.CreateHtmlContent(item.GetPropertyValue<string>("abstract")),
            PublishDate = item.GetPropertyValue<DateTime>("date")
        };

        syndicationItem.AddPermalink(/* Link to the content item */);

        syndicationItem.Authors.Add(new SyndicationPerson(/* Get the author of the content item */));

        return syndicationItem;
    }
}