[Orgmode] Re: Vertical split in Emacs 23

[Ryan C. Thompson]

I believe the function you're looking for is split-window-sensibly. Try 
M-x describe-function split-window-sensibly. It describes all the 
relevant variables that control its behavior.

If you wish to affect the behavior of only a specific case of splitting 
windows (for example, the org-todo function) you can use advice to 
temporarily modify one or more of these variables for the duration of 
the function call. For example, the following (untested!) code should 
guarantee a vertical split for org-todo:

(defadvice org-todo (around tweak-splitting-behavior activate)
  "Tweak the sensible window splitting behavior for org-todo."
  (let ((split-height-threshold 0))
    ad-do-it))