http://e26whn2524322mkxb3cbyk27ev2ihhq2biz35hty7gzgsyrwrygq27yd.onion/images/benscomputer_no-ip_org_Archive/2009/Feb/191925022009.shtml
The best we can do, sadly, is to catch people as it happens, and hopefully before, blocking sites will not aid
in this, however monitoring traffic to them could. Why block the sites? If they have been identified why not
monitor who accesses them and then keep any eye on their activities thereafter.