He tunnelled low-bandswith video over DNS, before finding a more serious bug in DNS.
I meant to say "stream video over DNS", as per acg's link below ... it's been a long day
Very cool hack. I especially love the inclusion of the Perl code to "use" it, as if leaving it out would leave people thinking "this is cool, but how can I use it in perl?!"
You can try this using the native OS DNS lookup tools as well -