John Gruber on OpenDNS:
The other thing about OpenDNS is that it is fast, fast, fast — for me, it makes web surfing noticeably faster than using the default DNS servers I get from Comcast.
I have noticed this ‘speed’ boost as well as what appears to be a quicker consumption of DNS changes than that of my ISP, Cox Communications.
This is in addition to the management and security features offered through OpenDNS, including those mentioned by Rob Griffiths:
Consumer Reports touted Firefox or Opera over Safari because of the built-in anti-phishing tools in those first two browsers; Safari has no such built-in capability. There is, however, a free service you can use that will give every browser on your Mac a full set of anti-phishing tools (and additional tools, if you choose to use them). This service is called OpenDNS, and it’s a free replacement for your Internet service provider’s (ISP) domain name servers.
Which is to say using OpenDNS would be a worthwhile option for anyone using a browser.