Anyone looking to relieve the pain of no non-Windows support from their hardware VPN vendor or that has issues wading through the IPSec options to get vpn working from their Linux or Mac machines should take a look at OpenVPN.  This firewall project is based on the SSL standard that has been battle tested by all the ecommerce applications out there and is fairly easy to set up.  I had a test server up and running in about 30 minutes on Ubuntu and that included reading a bunch of documentation before actually doing the install.  Ubuntu repositories have a recent version that is a good place to start.  Here's a decent tutorial to follow.