Google Public DNS service is a free DNS service provided by google. It is an effort from Google to make internet Faster. Sometime user do face some embarrassing issues with their ISP’s own DNS server which can be resolved  by using Google’s Public DNS service.

It is very simple to configure Google Public DNS, here are the steps:

http://code.google.com/speed/public-dns/docs/using.html

For more information visit the following links:

http://en.wikipedia.org/wiki/Google_Public_DNS

http://googleblog.blogspot.com/2009/12/introducing-google-public-dns.html