DraggableBillboard.cs

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using UnityEngine;
using System.Collections;

//
// http://answers.unity3d.com/questions/12322/drag-gameobject-with-mouse.html
//

public class DraggableBillboard : MonoBehaviour 
{
    private Vector3 screenPoint;
    private Vector3 offset;

    void OnMouseDown()
    {
        maxCamera.cameraStop = true;
        screenPoint = Camera.main.WorldToScreenPoint(gameObject.transform.position);

        offset = gameObject.transform.position - Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z));
    }

    void OnMouseDrag()
    {
        maxCamera.cameraStop = true;
        Vector3 curScreenPoint = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z);

        Vector3 curPosition = Camera.main.ScreenToWorldPoint(curScreenPoint) + offset;
        transform.position = curPosition;
    }

    void OnMouseUp()
    {
        maxCamera.cameraStop = false;
    }

}