Nav is a lightweight solution for Emacs users who want something like TextMate’s file browser, or the Eclipse project view. Unlike these two, Nav only shows the contents of a single directory at a time. Nav can be run painlessly in terminals, where Speedbar either fails on its attempt to make a new frame or is hidden. Nav’s terminal-friendliness comes from running in the frame where it was started, keeping window management simple. The Nav key bindings are also simple — each key command is a single keystroke long.

via emacs-nav – Emacs mode for filesystem navigation – Google Project Hosting.