When you expand the size of Mac OS X’s Character Viewer, it doesn’t just increase the dimensions of the well to accommodate more characters—it proportionately increases the sizes of the characters (you can toggle the Character Viewer in the menubar from the System Preferences > Languages pane, or with the Command+Option+T shortcut in almost any app). It’s a neat touch and, although probably breaking from the HIG a bit (though I wouldn’t be too sure about that), feels like the right thing to do in this case.