well i cannot find a way to show only particular objects in hierarchy but i found a way to see the list of objects in a custom window and select the objects using that window in the hierarchy.

using UnityEngine;
using System.Collections;
using UnityEditor;

public class TagSearcher : EditorWindow {

 static TagSearcher window;
 static string tagValue="";
 static string oldTagValue;
 static Vector2 scrollValue=Vector2.zero;
 static GameObject[] searchResult;

 [MenuItem("EditorUtility/TagSearcher")]
 static void OpenTagSearcher()
 {


     window = (TagSearcher)EditorWindow.GetWindow (typeof (TagSearcher));
     searchResult =  GameObject.FindGameObjectsWithTag(tagValue);


 }

 void OnGUI()
 {


    oldTagValue=tagValue;

    tagValue=EditorGUILayout.TagField(tagValue); 


    if(tagValue != oldTagValue)
    {


       searchResult = GameObject.FindGameObjectsWithTag(tagValue);
       Selection.objects = searchResult;

    }

    scrollValue=EditorGUILayout.BeginScrollView(scrollValue);

    if(searchResult != null)
    {

       foreach(GameObject obj in searchResult)
       { 
          if(obj !=null)
          {
             if(GUILayout.Button(obj.name))//,GUIStyle.none))
             {
                 Selection.activeObject =  obj; 
                 EditorGUIUtility.PingObject(obj);
             } 
         }
         else
         {
             searchResult = GameObject.FindGameObjectsWithTag(tagValue);
             Selection.objects = searchResult;
             break;
         }
     }

  }

  EditorGUILayout.EndScrollView();
  } 

}

By default it will select all objects with that tag. but you can select the individual objects also using the window.

You can see object by component just by adding :
t:mycomponent in the search field or you can do something like Seth said : http://docs.unity3d.com/Documentation/ScriptReference/Selection-objects.html