http://www.storm.net.nz/projects/7
http://www.securityfocus.com/archive/101/494960
Not exactly answering your question, but those two tools can get
around the encryption with local access to your computer.
If you're looking to save a few bucks and you don't want to muck around
with SSH tunnels but still have strong security, have a look at OpenVPN.
It's a really excellent SSL based VPN that is also an opensource
project supported by donations.
Clients are available for Mac, Windows 2000/XP/Vista and Linux. The
site is www.openvpn.net if I remember correctly.
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David Hoelzer
Director of Research, Enclave Forensics
Senior Fellow, SANS Technology Institute