HtmlString IHtmlString and HttpUtlity.HtmlEncode in ASP.NET 4

I was doing a bit of training on ASP.NET MVC 3 with Razor when the discussion turned to encoding HTML output. This discussion can actually get fairly involved ( well, interesting at least ) when one continues the discussion with HTML Encoding Nuggets, Html.Raw in ASP.NET MVC 3, MvcHtmlString, and so forth, but let's just tackle the basics in a quick blog post on HtmlString, IHtmlString, and