An extension to example code for "Where did that component go?" from AngryAnt

ComponentLister.cs

/*
 * Displays gameobjects linked to each script present in a scene, useful for development and debugging.
 * Added features:
 * You can search for a particular component, and turn off UnityEngine componets from displaying. 
 * While searching you don't have to type the entire name.
 */
using UnityEngine;
using UnityEditor;
using System.Collections;

public class ComponentLister : EditorWindow
{
	private Hashtable sets = new Hashtable();
	private Vector2 scrollPosition;
	private string searchText = "";
	private bool showEngineClasses = false;
	private bool showOnlySearched = false;
	
	[ MenuItem( "Tools/ComponentLister" ) ]
	public static void Launch() {
		EditorWindow window = GetWindow( typeof( ComponentLister ) );
		window.title = "Components";
		window.Show();
	}
	
	void OnHierarchyChange () {
		UpdateList ();
		Repaint ();
	}
	
	public void UpdateList()
	{
		Object[] objects;
		sets.Clear();
		objects = FindObjectsOfType( typeof( Component ) );
		foreach( Component component in objects ) {
			if( !sets.ContainsKey(component.GetType()) ) {
				sets[ component.GetType() ] = new ArrayList();
			}
			(( ArrayList )sets[ component.GetType() ]).Add(component.gameObject);
		}
	}
	
	public void OnGUI()
	{
		GUILayout.BeginHorizontal( GUI.skin.GetStyle( "Box" ) );
		showEngineClasses = GUILayout.Toggle(showEngineClasses, "showEngineClasses");
		GUILayout.EndHorizontal();
		
		GUILayout.BeginHorizontal( GUI.skin.GetStyle( "Box" ) );
		showOnlySearched = GUILayout.Toggle(showOnlySearched, "showOnlySearched");
		GUILayout.EndHorizontal();
		
		GUILayout.BeginHorizontal();
		GUILayout.Label( "Components in scene:" );
		GUILayout.FlexibleSpace();
		if( GUILayout.Button("Refresh") ) {
			UpdateList();
		}
		GUILayout.EndHorizontal();
		GUILayout.BeginHorizontal();
		GUILayout.Label("Search");	
		GUI.SetNextControlName("SearchField");
		searchText = GUILayout.TextField(searchText, 25);
		GUILayout.EndHorizontal();
		
		scrollPosition = GUILayout.BeginScrollView(scrollPosition);
		if(!showOnlySearched) {
			foreach( System.Type type in sets.Keys ) {
				if(!showEngineClasses) {
					string str = type.ToString();
					if (str.StartsWith("UnityEngine.")) {
						continue;
					}
				}
				GUILayout.Label( type.Name + ":" );
				foreach( GameObject gameObject in ( ArrayList )sets[ type ] ) {
					if( GUILayout.Button( gameObject.name ) ) {
						Selection.activeObject = gameObject;
					}
				}
			}
		} else {
			foreach (System.Type type in sets.Keys) {
				string lsearchText = searchText.ToLower();
				string s = type.Name.ToString().ToLower();
				if (!s.StartsWith(lsearchText))
				{
					continue;
				}
				GUILayout.Label(type.Name + ":");
				foreach (GameObject gameObject in (ArrayList)sets[type]) {
					if (GUILayout.Button(gameObject.name)) {
						Selection.activeObject = gameObject;
					}
				}
			}
		}
		GUILayout.EndScrollView();
		if (Event.current.isKey) {
			GUI.FocusControl ("SearchField");
		}
	}
}