I've recently been given the plug for my macbook and then weaseled out an old monitor from a friend, so I have gone to 2 screens, and not spent any money!!!!!! I have already found it amazing for the amount freedom it has given me when navigating my way around files whilst working in photoshop. I can look for the right texture or other item x, whilst still having the original file open and handy. When coding, it meant I could preview what I was coding and still have all the right windows open. Coda on screen one, chrome open on screen 2. It's great! Who else uses 2 screens and why?