I really like the one with the baby in the overalls and then the one above this post ^. Awesome stuff.
It's great how such a simple edit can make a picture look so cool.
I personally don't use these steps--I use the magic wand to select the portion I want to stay colored, copy the selection (ctrl+c), then I de-select (ctrl+d), turn the whole image to black and white under the Adjustments menu, and paste (ctrl+v) the colored selection, and it always pastes exactly where it should. I hope that helps.
Here's a couple of mine (I took these pictures myself at my friend's wedding):