How to open the 'Projects' panel in Netbeans

In Netbeans, to the top left of where the code is, there used to be two panels, one called 'Projects' where you could click a project name to open a tree of all the directories and files in it, and you could double click a file to edit it.

Below it is the navigation panel which shows the class names, methods, etc contained in the file you're viewing.

I accidently clicked the close button on the projects panel and can't figure out how to get it to open again, any ideas?

In Netbeans 6.8 on Windows, going to Window -> Projects brings it back for me. CTRL + 1 works as the shortcut.

Click Window > Reset Windows will give you back the old state of all windows!