Configuration setting for HTML encoded field types

Following setting can be used to skip HTML Encoding of values, when they are rendered.
   
    <!--  RENDERING - HTML ENCODED FIELD TYPES
            Specifies a pipe-separated list of field types that should be HTML encoded when rendered by the <renderField> pipeline.
            Default value: text|single-line text
      -->
      <setting name="Rendering.HtmlEncodedFieldTypes" value="text|single-line text" />


Good articles :

http://sitecore.stockpick.nl/english/single-line-text-with-html.aspx
http://sdn.sitecore.net/Forum/ShowPost.aspx?postid=10087