Tilt Shift Miniature Effect in Photoshop - How To

I love the tilt shift effects that you are seeing lately where you take an actual scene and make it look like a model. The opening credits for Sherlock have some beautiful ones. The look reminds me of old View Master reels. I keep trying different methods and this is my favorite so far. I started with the excellent tutorial on We Graphics and made some changes.

I thought about doing a full tutorial but this so easy it only takes a few minutes.

   Place you photo in Photoshop.
   Command J to duplicate the layer
   Filter > Blur > Lens Blur. I can't give you the settings to use since it varies with the photo, all three examples were different. Play with the sliders until you are happy with the blur.
   Add a Layer Mask. It's the icon on the bottom of the Layers Palette that resembles a camera (a rectangle with a circle inside it).
   Use a soft brush with black to paint out the areas you want to be crisp. I painted the center trees, the Segway riders, Paul Bunyon and Babe. If you make a mistake, paint over it with white.
   You might need to bump up the contrast. If you do, Duplicate the Layer, by pressing Command J and apply an Overlay Blending Mode. Paul has an Overlay blending mode, the others do not.