I'm a little surprised that the article mentions Google so often, yet never once mentions that Google has their own DNS, which I use. I couldn't tell you if it's made any difference...

I will say that I find OpenDNS completely useless as a filtering service. I do tech support for a church, and one of the ways I help them filter out bad stuff on their network is OpenDNS. It blocks some stuff, but then lets other sites right through. Even on their highest filtering level, they still let sites like Vivid.com through, which I find very odd.