DNS resolution speeds are very important and so is the stability of DNS which often can be flaky especially from your own ISP. Without DNS it is very difficult for you to be able to visit any website on the internet as DNS resolves a domain name such as Google.com to its corrosponding IP address which is the numerical address where the website can be found which your browser needs.
There has been for the past few years OPENDNS which has an enourmous DNS table available to the public and by simply changing a couple of numerical values in your network settings you have faster DNS. But now Google last week released their public DNS available for every one to use just as OPENDNS. There are several differences which we shall cover in the weeks to come as Google extends their service further.
In the mean time take a look at NameBench http://code.google.com/p/namebench/ available for Mac OS X, Windows and Linux to determine which DNS service may be best for yourself and outperform your local ISP DNS.


