I'm big fan of xterm with bitmap fonts (usually fixed, Terminus or Neep) for my terminals, mostly because it's small and quick (compare find . in your home directory full of files in some terminal with TrueType fonts and xterm with bitmap fonts to see difference).
But, I really wanted to have alternative way to change font size (other than Ctrl+right-click). I already wrote about xtermcontrol, but in my short usage of Gnome Terminal I noticed that having keyboard shortcuts for changing font size is really handy. And as always, xterm has solution for it. Put something like this in your ~/.Xdefaults:
XTerm.VT100.translations: #override \ Meta <Key> minus: smaller-vt-font() \n\ Meta <Key> plus: larger-vt-font() \n\ Meta <Key> KP_Subtract: smaller-vt-font() \n\ Meta <Key> KP_Add: larger-vt-font() \n\ Super <Key> minus: smaller-vt-font() \n\ Super <Key> plus: larger-vt-font() \n\ Super <Key> KP_Subtract: smaller-vt-font() \n\ Super <Key> KP_Add: larger-vt-font() \nI decided to bind Meta (usually Alt) or Super (usually Windows key) and + or - on main keyboard or numeric keypad for quick and fail-safe access to terminal font size. As always with X server resource database whitespace is very important. Notice space after #override in first line.
You can invoke this configuration with something like xrdb -merge ~/.Xdefaults which you can put in your .xinitrc. You can make various other adjustments (see man xterm for all details), but usually you just want to change default font and reverse video (to get white on black terminal) using something like:
XTerm.VT100.font: -*-terminus-medium-r-normal-*-16-*-*-*-*-*-iso10646-* XTerm.VT100.reverseVideo: true