For erb text highlighting in gedit. put it here: /usr/share/gtksourceview-2.0/language-specs/

erb.lang

<?xml version="1.0" encoding="UTF-8"?>
<!--
 This is a smashup by Justin Richter of html.lang and ruby.lang
 html.lang 
   Authors: Marco Barisione, Emanuele Aina
   Copyright (C) 2005-2007 Marco Barisione <[email protected]>
   Copyright (C) 2005-2007 Emanuele Aina
 ruby.lang 
   Author: Archit Baweja <[email protected]>
   Copyright (C) 2004 Archit Baweja <[email protected]>
   Copyright (C) 2005 Michael Witrant <[email protected]>
   Copyright (C) 2006 Gabriel Bauman <[email protected]>

 This library is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

-->
<language id="erb" _name="Ruby(ERB/RHTML)" version="2.0" _section="Scripts">
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    <property name="mimetypes">application/x-ruby;text/x-ruby</property>
    <property name="globs">*.erb;*.rhtml</property>
    <property name="line-comment-start">#</property>
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