I'll be presenting on using Erlang for an authoritative DNS server at StrangeLoop this year (https://thestrangeloop.com/sessions/erlang-for-authoritative...). If you can make it hopefully you'll get some good tidbits on why I selected Erlang and what kinds of benefits and drawbacks became evident as the system developed. If not then perhaps the sessions will be recorded (I believe they are supposed to be, but I'm not 100%).