Wow, what perfect timing. Here's what I found from a friend's workplace when I referred her to something from my own website, 485i.com (which hosts, among other things, my resume, social network list, freelance web dev + photographer work samples and my staging server):

Internet access to the requested website has been denied based on your user profile and organization's Internet Usage Policy.
Category: Web Logs/Personal Pages
Blocked URL: http://485i.com/

To submit this blocked site for review, click here. For assistance, contact your Administrator.
8e6 R3000 Enterprise Filter provided by 8e6 Technologies. Copyright 2007. All rights reserved.

Now, after contacting 8e6 they've reclassified my site as a "business" site. But I'm not sure this change was pushed down to active routers/firewalls. Also, I work at a company with a strict firewall as well, and any legitimate request for a correction or a re-listing is usually met with contempt and scorn. Similarly, my friend said this about the same process of submitting sites for review: "They yell at me when I ask them to unblock sites." This is how the corporate world functions, and I fear that one day we'll all be trapped daily without meaningful media access because corporate management wants total productivity (and total protection from legal liability) at all times.

You're not supposed to look over, you're supposed to tap your foot under.