I have the great pleasure of having the office down the hall from Dennis Pilarinos and David Wortendyke, who are two of the prime movers behind some really cool stuff that just went public: http://labs.biztalk.net

Thanks to these guys, you don't have to be a rocket scientist to traverse NAT's and Firewalls securely.

Don't let the Biztalk name fool you...go check their stuff out.