Jon Udell makes some points about side effects of the current blaster worm, and how if affects non Microsoft customers. Since the worm generates so intense traffic, ISP's that you've never heard of has taken to blocking port 135 on which it attacks. That means that the routing layer - that is normally completely transparent to you - sudden fails to route traffic on this port, even between networks that are not vulnerable to the blaster virus, simply to protect their networks against virus induced overload. This may or may not be necessary, but if it spreads then the concept of free traffic on the internet could soon be over again.