I like the catch phrase of this article blogged by Tom O'Reilly referring to this Financial Times article The Future Ends at the Firewall
The idea is the enterprise networks are stifling innovation with restrictive internal security management. An interesting debate. One of the most powerful things about Internet technologies is the way they lower the cost on entry for new services, but if everyone has to tunnel through firewalls and NAT gateways to get them to work, it isn't so easy. One solution is to move towards IPv6 which obviates the need for NAT gateways to preserve scarce IPv3 address space. This may usher in a new era of distributed management rather than choke point firewalls, we'll see.