OpenDNS.org – Providing a safe and faster DNS.
I heard about them from Matt Mullenweg and have been using their service without any problems. In fact, I’ve noticed DNS looks are faster, and it’s already fixed several of my typos in domains which is handy. Previously, my DNS lookups were kind of slow, but now they’re zipping right along and it is indeed invisible in all the right ways as Matt observed.
If you want to try it out, they provide easy to follow instructions for your convenience.