This version of the plugin works ONLY with Rhythmbox 2 (last tested: v2.96). You can get the plugin's version for Rhythmbox 3 on the lotan rhythmbox-ampache repository. Original source of this plugin : http://code.google.com/p/rhythmbox-ampache/
Read Ampache Access Control Lists documentation and create an ACL for RPC (XML API) http://ampache.org/wiki/config:acl
Create an ampache directory, untar and put files into it then put this directory into $HOME/.gnome2/rhythmbox/plugins or /usr/lib/rhythmbox/plugins
Run rhythmbox (with "-D ampache" if you want debug from command line)
Click Edit, select Plugins dialog box, enable "Ampache Library"
Click Configure, enter your informations, for example URL: http://test.com/server/xml.server.php
Click on Ampache under Shared, songs should appear in the browser
Copyright (C) 2008-2010 Rhythmbox Ampache plugin team
Copyright (C) 2008 Seva firstname.lastname@example.org
Portions from 'git clone http://quickplay.isfound.at' Copyright (C) 2008 Kevin James Purdy irc://irc.freenode.org/purdyk,isnick
This program 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, 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.