Ace jump mode is a minor mode of emacs, which help you to move the cursor within Emacs. You can move your cursor to ANY position ( across window and frame ) in emacs by using only 3 times key press. Have a try and I am sure you will love it.

In 1.0 version, ace jump mode can only work in current window.

However, this limitation has already been broken in 2.0 version. With ace jump mode 2.0, you can jump to any position you wish across the bounder of window(c-x 2/3) and even frame(c-x 5).

Here is a simple one for you to learn how to use ace jump, Demo

Usage:

"C-c SPC" ==> ace-jump-word-mode

enter first character of a word, select the highlighted key to move to it.

"C-u C-c SPC" ==> ace-jump-char-mode

enter a character for query, select the highlighted key to move to it.

"C-u C-u C-c SPC" ==> ace-jump-line-mode

each non-empty line will be marked, select the highlighted key to move to it.

Thanks emacsrocks website, they make a great show to ace jump mode, refer to here.

;;
;; ace jump mode major function
;; 
(add-to-list 'load-path "/full/path/where/ace-jump-mode.el/in/")
(autoload
  'ace-jump-mode
  "ace-jump-mode"
  "Emacs quick move minor mode"
  t)
;; you can select the key you prefer to
(define-key global-map (kbd "C-c SPC") 'ace-jump-mode)



;; 
;; enable a more powerful jump back function from ace jump mode
;;
(autoload
  'ace-jump-mode-pop-mark
  "ace-jump-mode"
  "Ace jump back:-)"
  t)
(eval-after-load "ace-jump-mode"
  '(ace-jump-mode-enable-mark-sync))
(define-key global-map (kbd "C-x SPC") 'ace-jump-mode-pop-mark)

;;If you use viper mode :
(define-key viper-vi-global-user-map (kbd "SPC") 'ace-jump-mode)
;;If you use evil
(define-key evil-normal-state-map (kbd "SPC") 'ace-jump-mode)

See FAQ