Not directly Linux related, but something I wouldn't like to forget :-)
The Mozilla support site shows keystrokes really neatly. Like this: Ctrl+Alt+Del or Ctrl+W. The style sheet I used is:
kbd {
padding: 0px 1px 0px 1px;
border-width: 1px 3px 3px 3px;
border-style: solid;
background: #faf6f6;
color: #000;
border-color: #edd #baa #baa #eed;
font-size: 10pt;
font-style: monospace;
font-variant: normal;
font-weight: normal;
}
End result is a nice keyboard effect of sorts.