These ebuilds come from http://wiki.gentoo.org/wiki/Project:Emacs/Overlay.
If you have some problems, go to the official site first.
anything : Open anything - QuickSilver-like candidate-selection framework ( http://www.emacswiki.org/emacs/Anything )
async : A simple asynchronous framework for Emacs ( https://github.com/jwiegley/emacs-async )
auto-lang : Guess language of current buffer ( http://www.emacswiki.org/cgi-bin/wiki/AutoLangMode )
babel : Interface to web translation services such as Babelfish ( http://www.hoetzel.info/Hacking/emacs/ )
cedet : CEDET: Collection of Emacs Development Tools ( http://cedet.sourceforge.net/ )
cgi : Using Emacs for CGI scripting ( http://repo.or.cz/w/muse-el.git )
cgi+ : Run CGI inside Emacs ( http://www.emacswiki.org/cgi-bin/wiki/cgi%2B.el )
codepad : Interface to the codepad.org paste service ( http://codepad.org/ )
completion-ui : Library that implements user-interfaces for in-buffer completion ( http://www.dr-qubit.org/emacs.php#completion )
diff-mode- : Extensions to diff-mode.el ( http://emacswiki.org/emacs/diff-mode-.el )
dvc : New version control backend for distributed systems (like bzr, git) ( http://download.gna.org/dvc/ )
elip : The Emacs Learning Instruction Program ( http://www.gnuvola.org/software/elip/ )
emacs-common-gentoo : Common files needed by all GNU Emacs versions ( http://www.gentoo.org/proj/en/lisp/emacs/ )
emacs-daemon : Gentoo support for Emacs running as a server in the background ( http://www.gentoo.org/proj/en/lisp/emacs/ )
faith : Helps spreading the true faith! ( http://www.gnufans.net/~deego/emacspub/lisp-mine/faith/ )
find-recursive : Find files recursively in a directory ( http://www.webweavertech.com/ovidiu/emacs/ )
fold-dwim : Unified user interface for Emacs folding modes ( http://www.dur.ac.uk/p.j.heslin/Software/Emacs/ )
gentoo-syntax : Emacs modes for editing ebuilds and other Gentoo specific files ( http://www.gentoo.org/proj/en/lisp/emacs/ )
js2-mode : An improved JavaScript mode for GNU Emacs ( http://code.google.com/p/js2-mode/ )
mediawiki : MediaWiki client for Emacs ( https://launchpad.net/mediawiki-el )
nummove : A graphical game of fifteen ( http://www.emacswiki.org/cgi-bin/wiki/Nummove )
oddmuse : Edit pages on an Oddmuse wiki ( http://www.emacswiki.org/cgi-bin/wiki/OddmuseMode )
org-mode : An Emacs mode for notes and project planning ( http://www.orgmode.org/ )
remem : Remembrance Agent plugin for Emacs ( http://www.remem.org/index.htm )
rudel : Collaborative editing environment for GNU Emacs ( http://rudel.sourceforge.net )
smex : A smart M-x enhancement for Emacs ( http://www.emacswiki.org/emacs/Sme )
snippet : Insert snippets of text into a buffer ( http://www.kazmier.com/computer/ )
twitter : Simple Emacs-based client for Twitter ( http://www.busydoingnothing.co.uk/twitter-el/ )
vm-bogofilter : An interface between the VM mail reader and the bogofilter spam filter ( http://www.cis.upenn.edu/~bjornk/ )
w3m-type-ahead : Type-ahead support for emacs-w3m ( http://mph-emacs-pkgs.alioth.debian.org/WthreemTypeAheadEl.html )
weblogger : Weblog maintenance via XML-RPC APIs ( http://jwickers.wordpress.com/emacs-hacks/ )
whizzytex : An Emacs minor mode for incremental viewing of LaTeX documents ( http://cristal.inria.fr/whizzytex/ )
wtf : Look up conversational and computing acronyms ( http://mwolson.org/projects/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a emacs
For Paludis use this rsync : rsync://gentoo.zugaina.org/emacs-portage
If you have a problem : ycarus(-at-)zugaina.org