Also too, it would be possible to block people out based on an entire range of IP addresses... For example, my DSL provider (verizon) owns a set of IP addresses for use in my area (something like man.nh.verizon.net or whatever, I can't really remember right now), and every time I turn on my computer (well, actually, every time I reboot my router) I get a new address (something like 64.00.00.00.man-nh.verizon.net) and it would be possible to block out everyone in man-nh.verizon.net, myself included. Of course, that would be a drastic move though...
-Rick Miller
..."As a matter of fact, I AM a rocket scientist!"