documentation from very reputable places

• sitemap
• https://help.ubuntu.com/community/OpenVPN

third party

• http://john.de-graaff.net/wiki/doku.php/links/openvpn
• http://wiki.mikrotik.com/wiki/OpenVPN
• http://www.packtpub.com/article/setting-up-openvpn-with-x509-certificates
• http://chschneider.eu/linux/server/openvpn.shtml
• http://www.zeroshell.net/eng/openvpn-server/