For anyone with a laptop who works in a library or other quiet area, system beeps every time you press the backspace key one too many times, or just using emacs, can be quite disturbing.
To shut them off:
open an xterm or terminal, and enter the two lines
Hope this helps.Code:xset b off xset b 0 0 0
note: this does not work if run before X. To have it run as default, you can place it in your .xinitrc before the windowmanager. If you're using Gnome or KDE, it is probably easier to just turn off the "System Bell" or set it to "Visable Only" in your respective settings manager.