After Rotation, go back to normal attributes help

Hey all. I have a small problem with my entity going back to normal rotation after the player releases the corresponding buttons for the rotation. I'd like the entity to slowly turn back to a 0,0,0 rotation. Could you give me an example of how to do that? Here is my code so far:

Code (csharp):

1.  
2. //this script is to control the Ship
3. //It uses a traditional WASD control scheme, but W = movement up on Y-Axis
4. //S = Movement down on Y axis
5.  
6.  
7. function Update() {
8.     transform.Translate(Time.deltaTime,0,0, Camera.main.transform); //Gives initial thrust
9.  
10.     if(Input.GetKey(KeyCode.S)) {
11.         transform.Translate(0,-.02,0,Camera.main.transform); //slowly move the ship down
12.         transform.Rotate(0, 0, -.05); //rotate the ship slowly downwards
13.     }
14.    
15.     if(Input.GetKey(KeyCode.W)) {
16.         transform.Translate(0,.02,0,Camera.main.transform); //slowly move the ship up
17.         transform.Rotate(0, 0, .05); //rotate the ship upwards
18.     }
19.    
20.         transform.Rotate(0,0,0); //obviously this is where I need the rotateToNormal code.
21. }

 

http://unity3d.com/support/documentation/ScriptReference/Quaternion.Slerp.html

You might want to try the Vector3 version.