I wonder why people put up with ISP's DNS facilities when OpenDNS is so good. It's very secure, very quick (especially for UK resolvers) and very reliable.
It has excellent features which include selective blocking of categories of web sites including phishing and pornography, RFC1918 address blocking, malware/botnet protection and OpenDNS's slick SmartCache feature.
OpenDNS's passion for DNS is infectious and they do it better than anyone else.