Designtnt - Create Smart Objects in Photoshop | 1.35 Mb
I’m sure you’ve seen and used Smart Objects in Photoshop for a long time, but you haven’t yet seen their purpose. I’m saying this because I’ve been in this situation myself and most likely, you are or will be soon, too.
That’s why in this tutorial I will show you their true power and how they can turn several hours of work into just a few minutes. The technique is quite simple and it shines particularly when you want to modify multiple designs containing similar objects,such as mock-up sets for laptops, smartphones and displays.

Info:
http://www.designtnt.com/create-smart-objects-photoshop/