Interactive line spacing

[mhuhtala]

Does anyone else miss interactive setting of line spacing in Emacs? I  
use 0 for code and certain types of data files with aligned columns,  
and 5 or more for natural language text. I put this in my .emacs:

(defun spaceout (&optional spacing)
  "Set line-spacing for the current buffer."
  (interactive "p")
  (setq line-spacing spacing)
  (recenter)
)

(global-set-key [?\C-+] 'spaceout)

The C-+ key binding is similar to Firefox and such.