Well what I have seen happen is almost the opposite in some ways.
Corporate networks seems to be moving toward a more fuedal model as "the King's deer" are "poached" by the vassels and his "Treasury" threatened by raiders, predators, and pestilences roaming the countryside (Internet). I see a lot more inward-facing firewall strategies as well as the now traditional outward-facing ones.
I know one outfit that has started balkanizing its own network with internal network security devices. Once you have a certain number of internal network nodes and population of users your internal risk of problems goes up. Nobody can afford to have one sloppy user bring a Slammer or worse inside the walls and have it run rampant and gut the Kingdom. Think about it: Is a network of 10,000 users that much different from the Internet?
In some shops simple web access to outside sites is beginning to be blocked as well as FTP, Telnet, SMTP, NNTP, IRC, etc. I'm not sure how much longer anybody would be able to count on a reviewer of prospective employees being able to reach out via a Citrix, Terminal Services, or VNC client to some sort of hosted service.
Not that slipping in a CD from outside or some USB flash memory dongle is considered a safe and approved practice either.
I wonder how soon ISPs will be forced to do this? Between legal pressure to make them enforce Copyrights and malware that threatens network bandwidth, usability, and stability... How soon before the Internet is effectively locked down into a broadcast television (or cable TV) model?
You could always host your stuff on a dial-in BBS type host. Oh! Don't forget, most organizations prohibit dial modems in corporate machines though.
One last comment:
Anybody know whether the U.S. Postal Service has stopped using those e-beam devices to sterilize mail yet? After the Anthrax scare there were lots of warnings not to mail flash memory devices, which were not only erased but destroyed by these sterilizers.
