The tip is this: you can download an application which will test various open dns servers, and tell you which is fastest, on average, for your particular setup. As it happens, the program is hosted/sponsored by Google, so you might wonder if it is does a fair test. Go head and wonder. If you have a way to find out for yourself, then you don't need the application.
Anyway, you can get the app here: namebench. There are versions for Windows, Mac OS X, and Linux/Unix.
For the average user, does this make any difference? I don't know. I am going to guess that most people would not notice the improvement, in most circumstances. But some will notice a significant improvement in their browsing experience. You are most likely to benefit if you often have the experience of clicking on a link, then waiting a few seconds before anything happens, or getting a page not found error that goes away when you try again, or getting random redirections that take you somewhere strange at first, but get the page you want when you try again.
How do you change the DNS settings in your system? It depends. The best way to do it, for most people, is to use your router's interface. There are too many different routers and interfaces for me to have any hope of giving instructions here. So you are on your own if you want to do that. Google gives instructions here, but they are fairly generic when it comes to routers. The instructions appear reasonably good for WIndows and Mac OS X users who want to change the settings for individual computers, without messing with the router. But then you have to do the same thing for each of your computers.
If there is only one computer in the house, then it does not matter how you do it.
Some people have raised privacy concerns about using Google's DNS. My opinion is that if you are worried about that, you should not use the Internet.
(HT: Dangerousmeta)








