If you are a new emacs user, I think emacs can really kill you :(
I try erlide(buggy for jump to defination, other is good) emacs-erlang mode(really hard for me), I finally choose sublime text2 for daily development. I suggest you can try it.
i install the following plugins:
package control
sublime-erlang
sublimerl
ctags
that's as good as I expected.
