OpenVPN [road warrior](http://en.wikipedia.org/wiki/Road_warrior_%28computing%29) installer for Debian-based distros.
This script will let you setup your own VPN server in no more than one minute, even if you haven't used OpenVPN before. It isn't bulletproof but it has been designed to be as unobtrusive and universal as possible.
If you don't care about sharing an IP address with more people, check out the awesome [LowEndSpirit](http://lowendspirit.com/) project too. They are providing IPv6 VPS with NATed IPv4 for only 3€/year.