Virtual Private Network Policy
Defines the requirements for Remote Access IPSec or L2TP Virtual Private Network (VPN) connections to the organization's network.
http://www.sans.org/resources/policies/Virtual_Private_Network.pdf

Solucom - Internet Firewall Security and Virtual Private Network (VPN) Solutions
Providers of Virtual Private Networking (VPN), Internet Firewall Security, Intrusion Detection and Managed IT security services. This includes consulting, the technologies, configuration and installation, and ongoing support.
http://www.solucom.com

VPN Hardware and Software
With VPN solutions from SonicWALL, your network can be private and secure and you can protect the exchange of data without compromising productivity.
http://www.ssimail.com/VPN_solutions.htm

What Is A Virtual Private Network?
A Network Computing Online Article
http://www.networkcomputing.com/905/905colmoskowitz.html

Digital Networking Systems
Application service provider for Software developers. - Offering application hosting and managed servers with expertise in Citrix Metaframe, server based computing and more.
http://www.dns-ny.com

ANXeBusiness
ANX provides global, secure, multi-provider, managed extranet/Virtual Private Network information exchange as well as customized intranet design and solutions, with 24/7 network support.
http://www.anx.com

Network Plumbing, LLC.
We are focused on providing computer network connectivity to small and medium business. This includes LAN's, WAN's, Intranets, and Virtual Private Networks's (VPN's)
http://www.network-plumbing.com

Network Security Software by Onix Networking
Onix Networking is a leading provider of world-class IT partnering with Google, Alcatel, Western DataCom, NetScreen, Juniper, LANDesk, Business Objects
http://www.onixnet.com

ViPNet
VPN SOFTWARE - IP Virtual Private Network Technologies, Firewall. INFOTECS GmbH
http://www.infotecs.biz/solution.htm

Virtual Private Network Consortium
Virtual Private Network Consortium -- VPNC
http://www.vpnc.org/