One PSD in multiple windows

Dutch designer Jonno Riekwel once tweeted a great tip for working in Photoshop regarding designing detailed UI elements. He pointed out the option to open one Photoshop document and displaying it in multiple separate windows. This means you can align multiple windows next to each other (or above/beneath one another for that matter).
Here’s an example of how we use it. Obviously the top window and the bottom window both show the same document; the map you’ll find on our website’s Contact page. In the bottom window the zoom is set to 2000% while the top window shows the document at it’s original (100%) zoom. Before we worked with this ‘trick’ we were constantly zooming in and out.

Another tiny extra advantage of working this way; being able to select anchor points in one window (say a 800% zoomed one), switch to the other window in which the same anchor points will be selected and to move those pixels around. Vice versa this works great too.
