A quick note about how to setup Aquamacs (Cocoa Emacs distribution) for coding Erlang (the next kid in town).

I assume you install Erlang via Macports so if you install it via any other mean, something will vary (I used to install it, along with everything else, from source; but currently the Macports is just easier).

The setup is simply adding the following lines into your ~/.emacs file

(setq load-path (cons "/opt/local/lib/erlang/lib/tools-2.6.4/emacs" load-path))
(setq erlang-root-dir "/opt/local/lib/erlang")
(setq exec-path (cons "/opt/local/lib/erlang/bin" exec-path))
(require 'erlang-start)

Please note that the actual path may vary from installation to installation (version numbers, most probably). So check yours.