I was just looking around for a possibility to connect to my computer at home secure thru a VPN. Unfortunately my router at home has no VPN feature implemented. As with most broadband packages, you get the cheapest router possible from your ISP. In my case I rely on the router as I get my television signal thru my internet connection and the router works as an authentication device for the media box from my ISP.
Anyway… I found a pretty exciting tutorial about setting up a VPN server on a Mac OS X machine on theilluminatedengineer.com.
Took me about 10 minutes to set it up and have it up and running.