As for the gentleman who cannot submit the forms, I assume the admin guys just block all data being sent by the http POST command. That to me sounds like a strange firewall restriction since forms are part of everyday life on the web. I do not know of many places that block the data going back out. To my understanding, the reason to route all outgoing data back through another firewall is to prevent people from inside the organization from doing bad things, and to prevent outsiders from jumping into a local server through a workstation. If sending forms or data through the POST method is a common problem for people behind a firewall then I think it would be appropriate to ask Apple to change the method of sending data from POST to GET which just ammends the information to the http header.
Most servers accept both methods.
Just my few thoughts. Maybe by providing a forum for people to exchange ideas, suggestions and solutions, we can come up with a working solution to this issue. Since forms like that can't go through our firewall, I still can't download QT4. No way around it.