Libs

• org-mode
• ediff-buffers / ediff-regions-linewise (bet you didn't know about the last one)
• SVN integration, with ediff (awesome)
• Keyboard macros
• PerlySense <-- on top of cperl-mode
• project-root
• sql-mysql - buffer
• yasnippet

Snippets:

;; Display trailing whitespace (use a very very light color)
(defun my-turn-on-show-trailing-whitespace ()
  "Set `show-trailing-whitespace' to t."
  (setq show-trailing-whitespace t))

(mapc (lambda (hook)
        (add-hook hook 'my-turn-on-show-trailing-whitespace))
      '(cperl-mode-hook))
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