As someone working for an ISP who has been tring to get these people to clean their PCs, if 500,000 are cut off from the Internet, that is 500,000 calls to their ISP to "fix" it. Thats somewhere between $1,000,000 - $1,500,000 in support calls.
I agree with this statement. I have been involved in this effort as well. There are two user demographics here: Business; and Consumer. In the consumer space, ISPs have been contacting their infected customers for two months now. I'm told customer remediation rates following notification are hovering around 15% across the Tier 1 and Tier 2 ISPs. So customers are notified, directed to a web portal containing additional information and links to the removal tool, and still only 15% are completing the task. If these customers wake up one day and they start getting 404 errors, they will flood the call centers costing the ISPs millions of dollars. I also agree that Fortune 500 companies should have had this cleaned two months ago. No excuses there...
For a long time, I've followed what I've read regarding URL lengths. 255 characters is it. Never let it get longer than that.
By the RFC's, 255 characters is the guideline, to maintain backward compatibility with old browsers, old proxy servers, and other miscellaneous hardware that may be in the way.
I went looking for more information, but found conflicting or outdated information. Who cares what the limits on Netscape 4 or MSIE 5 were.