Namebench

You may not know it,but you can choose which service changes the address you put in your browser to IP numbers,the authentic coordinates of the internet.
It's not something most users will think about,but it's surprising how much difference a change of DNS sever can make.
The mighty Google have recently started offering a service,so how do you know if it's better?Namebench can tell you.

Simply download the file and run it,and Namebench will open without installation.
Choose whether you want to include global (like Google DNS) and regional DNS services,
your data source (probably Firefox) and the Benchmark Data Selection.