In fact, that OpenVPN GUI has been imported into the main project.
As of september 21st, the current client download link is:
http://www.openvpn.net/index.php/open-source/downloads.htmlVersion 2.1-rc19. It's stable on XP, Vista 32/64, and Win7 32/64.
http://www.openvpn.net/release/openvpn-2.1_rc19-install.exeRun the installer, then extract your vpn config files to C:\Program Files (x86)\OpenVPN\config
(Remove the (x86) if you're on a 32bit install)
This should be two files, the .Pem generated by endian, and the .ovpn file that looks like this:
client
dev tap
proto udp
remote <external_hostname>
resolv-retry infinite
nobind
persist-key
persist-tun
ca endian.pem
auth-user-pass
comp-lzo
Good luck!