Amis blog has an entry all about OpenVPN
The post describes OpenVPN which is available from http://www.openvpn.net. Andre goes on to discuss the detailed features and uses of OpenVPN. Andre then discusses the platforms supported and let's us know that only version 2 will work on Windows XP. he then steps through an installation on Fedora Core 3 and then details the setup and use of OpenVPN.
This is an excellent short article and of use to anyone interested in protecting remote access to an Oracle server or database. There are two links on my Oracle security white papers page that discuss tunnelling SQL*Plus through an ssh tunnel. Search with CTRL-F for SSH on the page. These articles may also be of relevant interest to the same readers.