Tired of seeing stale dired buffers?

;; Auto refresh buffers
(global-auto-revert-mode 1)

;; Also auto refresh dired, but be quiet about it
(setq global-auto-revert-non-file-buffers t)
(setq auto-revert-verbose nil)

Auto revert mode looks for changes to files, and updates them for you.

With these settings, dired buffers are also updated. The last setting makes sure that you're not alerted every time this happens. Which is every time you save something.