Nice article. Good explanation and good guidelines.

Sometimes the evenly split windows don't cut it. I put the following function in the init.el file and bind "C-x 7" to it to adjust the current window and its peer to 70% and 30% sizes vertically. Same for horizontally with a "C-x 8" key binding.

    (defun partial-size-window ()
      "Set the two split windows to 70% and 30% vertically."
      (interactive) 
      (let ((size (- (truncate (* .70 (frame-height))) (window-height)))) 
        (if (> size 0) 
            (enlarge-window size))))

    (defun partial-size-window-h ()
      "Set the two split windows to 70% and 30% horizontally."
      (interactive) 
      (let ((size (- (truncate (* .70 (frame-width))) (window-width)))) 
        (if (> size 0) 
            (enlarge-window-horizontally size))))