Linode (Score 1)

http://www.linode.com/api/ Perl, Python, PHP bindings that let you manipulate your DNS entries, $20 a month will buy you a linode that runs the DNS server, decent security setup lets you distribute control without giving out your master passwords (and revoke access as necessary). I use them for my DNS management for a number of domains and I must say no one else I've seen has a superior DNS entry interface.