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rubikitchさんとこのブログを読んでwindowの切り替えをデフォルトのC-x oからC-tに変更
すごい楽。
http://d.hatena.ne.jp/rubikitch/20100210/emacs

(defun other-window-or-split ()
  (interactive)
  (when (one-window-p)
    (split-window-horizontally))
  (other-window 1))

(global-set-key (kbd "C-t") 'other-window-or-split)

あと、gtagsのgtags-pop-stackとかぶるからgtagsの方をC-zに変更

(setq gtags-mode-hook
	'(lambda ()
	(local-set-key "\M-t" 'gtags-find-tag)
	(local-set-key "\M-r" 'gtags-find-rtag)
	(local-set-key "\M-s" 'gtags-find-symbol)
	(local-set-key "\C-z" 'gtags-pop-stack)
	))
(setq gtags-select-mode-hook
	'(lambda ()
	(local-set-key "\C-z" 'gtags-pop-stack)
	))