Namebench

namebench is a python script that give you the fastest DNS servers available for you.
namebench runs a fair and thorough benchmark using your web browser history, tcpdump output, or standardized datasets.
nambench has a Tk interface, for start namebench type ./namebench.py
Now you can :
-include global dns providers like OpenDNS, Google public DNS ecc..
-include best avaiable regional DNS services
-include censorship check
You can also help speed up internet uploading your anonymized results.
After specify healt check performance and numbers of query you can start.
When nambench end save a result and give you the fastest dns !!!

You can also use command line:
Type -x for disable GUI
-C : enable censorship check
-q : specify numbers of query
-u : upload result

If you have any problem or you need some explanations just write under this post!