RE: quick change of face-size?

[Drew Adams]

    When using an overhead projector to show some file in emacs, it would
    be nice if there was a way to quickly change the face-size displayed.
    Something similar to c-+ and c-- in many gnome applications. Are there
    such short-cut bindings in emacs? If not, is there some command that
    will do this? (Note: I don't want to change my default font -- so emacs
    should just revert to my defaults the next time I start it up.)

http://www.emacswiki.org/cgi-bin/wiki/zoom-frm.el - commands to zoom a frame
in or out (changing the font size).

;;  Suggested key bindings:
;;
;;  (define-key global-map [S-mouse-1] 'zoom-frm-in)
;;  (define-key global-map [C-S-mouse-1] 'zoom-frm-out)
;;  ;; Get rid of `mouse-set-font':
;;  (define-key global-map [S-down-mouse-1] nil)

Or bind to `C-+' and `C--', if you prefer.