Articles for DNS:
sysadmin
DNS / dynamic / namecheap / bash

Dynamic DNS and namecheap.com

Some Commandline Fu to update your namecheap dns via wget
sysadmin
DNS / SRV / freedns / afraid.org / server

Adding SRV Records at http://freedns.afraid.org/

Even though it is not really documented you can add SRV entries to your http://freedns.afraid.org/ account