Just like in other applications, shortcut keys can make using software so much easier and Photoshop is no exception.  One of the more useful shortcuts that I’ve come across involves the process that once made me scratch my head and wonder why it needs to be such a pain.  Working with layered Photoshop files meant that to copy a section of the composite image I used to either merge all visible layers (Ctrl+Shift+E) which can be dangerous since its a destructive action (you’re essentially flattening your layers into one image) or save a copy of the file as a separate flattened image.  The latest edition of Photoshop (CS3) allows you to copy all visible layers within a selection using (Ctrl+Shift+C).  Luckily for those of us who are still using CS2 there is a shortcut that I’ve recently come across which lets you copy all visible layers and paste them into a new layer inside of your PSD by pressing (Ctrl+Alt+Shift+E).  This is useful since you can make multiple copies of different areas of the composite image and save them as part of the same PSD.  Its also important to note that because you’re making a copy the action is NOT destructive unlike the previously mentioned merge all command.