By default, Natty comes with 4 workspaces, which you can view by clicking the Workspace Switcher icon in the Unity Launcher. I personally don't like using multiple workspaces, so I wanted to change this to 1, so I didn't accidentally move windows to hidden workspaces (with hotkeys etc.) never to find them again. Others of you may want to reduce the number to 2, or even increase the number. An easy way to do this is with the Compiz Config Settings Manager, but if you don't have this installed, you can do it with gconf-editor.
- Hit
F2 and type gconf-editor - Navigate to apps > compiz-1 > general > screen0 > options
- Update the number of workspaces by changing the values of the variables hsize and vsize, which represent the horizontal and vertical number of workspaces respectively (I set both of mine to 1)
Note: if like me you only want to have 1 workspace, you probably will also want to get rid of the Workspace Switcher icon in the Unity Launcher. Once you have followed the above instructions, all you have to do is log out and back in again and the icon will be gone!