Good thing it's fairly easy to configure.
1. Download and open proXPN for Mac but don't install. It's needed to copy the config files.
2. Add new VPN configuration in Tunnelblick
|Choose "I have configuration files"|
|Choose "OpenVPN Configuration(s)"|
|Choose "Create Tunnelblick VPN Configuration"|
|Follow these steps.|
#remote miami.proxpn.com 443
And remove the "ssl/" directory from the certs.
Give it a test, and it connects after logging in.
The basic 300kbps free service will need some patience, but it's still faster than many free wifi services. ;-)