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Sample Code:
NETMatters0408.exe -- VS 2003 Code

VS2005 Code:
Visualizers
Testing Visualizers

VS2005 Visualizer Code Construction

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using Microsoft.VisualStudio.DebuggerVisualizers;

namespace MyVisual
{
    // TODO: Add the following to SomeType's defintion to see this visualizer when debugging instances of SomeType:
    //
    //  [DebuggerVisualizer(typeof(Visualizer1))]
    //  [Serializable]
    //  public class SomeType
    //  {
    //   ...
    //  }
    //
    /// <summary>
    /// A Visualizer for SomeType. 
    /// </summary>
    public class Visualizer1 : DialogDebuggerVisualizer
    {
        protected override void Show(IDialogVisualizerService windowService, IVisualizerObjectProvider objectProvider)
        {
            // TODO: Get the object to display a visualizer for.
            //       Cast the result of objectProvider.GetObject()
            //       to the type of the object being visualized.
            object data = (object)objectProvider.GetObject();

            // TODO: Display your view of the object.
            //       Replace displayForm with your own custom Form or Control.
            Form displayForm = new Form();
            displayForm.Text = data.ToString();
            windowService.ShowDialog(displayForm);
        }

        // TODO: Add the following to your testing code to test the visualizer:
        //
        //    Visualizer1.TestShowVisualizer(new SomeType());
        //
        /// <summary>
        /// Tests the visualizer by hosting it outside of the debugger.
        /// </summary>
        /// <param name="objectToVisualize">The object to display in the visualizer.</param>
        public static void TestShowVisualizer(object objectToVisualize)
        {
            VisualizerDevelopmentHost visualizerHost = new VisualizerDevelopmentHost(objectToVisualize, typeof(Visualizer1));
            visualizerHost.ShowVisualizer();
        }
    }
}