Many of never use the Caps Lock key, and lament the fact that such prime keyboard real estate is wasted by a useless key. This tip illustrates how to configure your gnome desktop so that the Caps Lock key acts like a third Ctrl key.
This task is accomplished through the Keyboard Preferences, accessible form the System menu under the Preferences section. Clicking on "Keyboard" will bring up the "Keyboard Preferences" window. In this window, navigate to the "Layout Options" tab, then expand the "Ctrl Key position" entry. In the options that appear, choose "Make CapsLock an additional Ctrl". The change should take effect immediately.