Google recently launched the Google Public DNS. It’s a free, global Domain Name System (DNS) resolution service, that you can use as an alternative to your current DNS provider.
They’ve posted a simple explanation about what DNS is and why it’s important. Essentially when you open a web address like http://www.norada.com your computer first asks your ISP the question “what is the network address for http://www.norada.com ?“. If your ISP’s DNS server is slow, your connection to the website will incur delays while it waits for the network addresses.
A similar service that’s been around for a while is http://www.opendns.com/
