I prefer using OpenDNS instead of local ISP DNS servers. OpenDNS is faster, better and totally free. Read the How to switch to OpenDNS in Ubuntu for faster browsing post on OMG Ubuntu to learn more.
What OpenDNS can do
OpenDNS is available to use for free and comes with plenty of features that make it a more desirable option over that of your ISP – not least of which is speeding up your browsing!
OpenDNS works anywhere in the world via a global network of servers that ensure all of your DNS requests automatically go to the OpenDNS server that’s physically closest to you.
“The result is an immediately-noticeable faster, more reliable Internet for everyone in your household.”
The service is so good it’s even used by many well-know brands all over the world, with customers ranging from Nvidia & BP to Lush! cosmetics and DC shoes.